Causal-mechanisms theory in Europe

The causal-mechanisms theory of social explanation has been influential throughout an extensive network of European philosophers and social scientists, often with a pretty direct connection to the analytical sociology research programme. Peter Hedstrom and his research network are particularly influential in this spread of ideas. It is worth mentioning a couple of books in the past ten years that have brought this approach to non-English speakers.

Philosopher Michael Schmid published Die Logik mechanismischer Erklärungen (The Logic of Mechanistic Explanation) in 2006. This appears to be the first full-length consideration of the "social mechanisms" theory of social explanation in German, and it is an impressive volume. Schmid also has an extensive chapter in English in Peter Demeulenaere's fine collection, Analytical Sociology and Social Mechanisms.

Schmid's book consists of careful analytical expositions of the theories of a dozen social scientists and philosophers who have advocated for this approach to social explanation, including both current and past proponents. Here is the table of contents, in my own non-expert translation, which gives an idea of the topics and authors Schmid concentrates on.

Michael Schmid, Die Logik Mechanismischer Erklärungen

1. The logic of sociological explanation

2. Philosophical foundations for an explanatory sociology

2.1 Mechanisms and the "Theory of complex phenomena" (Friedrich A. von Hayek)
2.2 Causality, social system, and mechanistic explanation (Mario Bunge)
2.3 Microfoundations and causal mechanisms (Daniel Little)

3. Mechanisms in sociological theory

3.1 Individual decisions and structural selection (Robert Merton)
3.2 Individual rationality and the interdependence of action (James S. Coleman)
3.3 Bridge principles and the transformation problem (Siegwart Lindenberg and Reinhard Wippler)
3.4 Macro-social phenomena and "rationality située" (Raymond Boudon)
3.5 Generative structuralism and generative mechanisms (Thomas J.Fararo)
3.6 Social mechanisms and the theory of rational decision-making (Peter Hedstrom and Richard Swedberg)
3.7 Process mechanisms and causal reconstruction (Renate Mayntz)
3.8 "Generative mechanisms" and "structural models" (Hartmut Esser)

4.0 The research heuristic of mechanismic explanation

Many of these authors considered here are core to the analytical sociology framework, including especially Merton, Coleman, Boudon, Hedstrom, Swedberg, Mayntz, and Esser.

A second relevant book appeared in 2004 in Italian. This is Filippo Barbera's Meccanismi sociali: Elementi di sociologia analitica. As the title indicates, the book provides a programatic introduction to the social mechanisms approach as expressed within the analytical sociology framework. The contents are descriptive of the focus of the book (again, in my non-expert translation).

Filippo Barbera, Meccanismi sociali

Introduction

I. Social mechanisms: history, authors, and objectives

I.1 Introduction
I.2 The Columbia School
I.3 Social mechanisms, theory of action and the crisis of the deterministic paradigm
Summary

II. Analytical sociology in the contemporary scene

II.1 Introduction
II.2 The relation between social theory and empirical research
II.3 Three principles for analytical sociology: causal processes, multi-level schemata, and formal theory
Summary

III. From macro to micro: the logic of the situation

III.1 Introduction
III.2 Interdependence between states: Sour Grapes and Ulysses and the Sirens
III.4 Institutional environments, exchange, and preferences
III.5 Training opportunities
III.6 Effect of social interaction
III.7 Structural effect
Summary

IV. The micro-micro axis: the principle of social action and rationality

IV.1 Introduction
IV.2 The forward-looking model
IV.3 The backward-looking model
IV.4 The cognitive model and framing
Summary

V. From micro to macro: aggregation and emergent effects

V.1 Introduction
V.2 Microfoundations of emergent effects
V.3 Strategic interdependency
V.4 Processual interdependence
V.5 Relational and spatial interdependence
V.6 Dynamic analysis of micro and macro
Summary

VI. Mechanisms in empirical research
VI.1 Introduction
VI.2 The diffusion of pharmacological innovation
VI.3 Individual educational choices
VI.4 Collective violence
Summary

VII. The integration of theory and social research

VII.1 Introduction
VII.2 Building the phenomena to be explained
VII.3 Postulating the generative mechanism
VII.4 Testing the mechanism
Summary

Here is a translation of a few lines from the introduction:

This book presents a theoretical perspective and empirical research that have gained growing acceptance in contemporary sociology. Many terms have been used to identify this perspective: "explanation by social or generative mechanisms", "sociological analysis", "sociology of causal processes", and "analytical sociology". Here we will use each of these expressions interchangeably. The book aims to rebuild from within the core of analytical sociology by isolating the principles and objectives shared, without carrying out a systematic comparison with other trends in contemporary sociology. This systematization had to first try to reduce the heterogeneity that characterizes the internal perspective of the social mechanisms approach, but not completely undo the specificities of the individual authors and the different proposals they put forward. The priority attention given to the objectives of clarification and synthesis of a complex and heterogeneous field has had to overshadow the critical evaluation of analytical sociology. This critical evaluation, incidentally, is not entirely absent, and in any case is made more simple after we have specified the conditions and objectives of the approach. (7)

German philosopher Renate Mayntz also takes up issues on mechanistic explanation in the social sciences. Her 2009 book, Sozialwissenschaftliches Erklären, is a volume of essays on the philosophy of social science and social science methodology that address issues about mechanisms as well as the macro-micro link. Here is a rough translation of the table of contents:

Renate Mayntz, Sozialwissenschaftliches Erklären

1. Social science knowledge interests and cognitive capabilities: An Introduction
2. Research methods and cognitive potential: natural and social sciences in comparison
3. Invitation to shadow boxing: sociology and modern biology

4. Rationality in Social Science Perspective
5. Causal reconstruction: theoretical statements in actor-centered institutionalism
6. Social mechanisms in the analysis of social macro-phenomena
7. Individual action and social events: The micro-macro problem in social science
8. Emergence in Philosophy and Social Theory (in English)
9. Embedded Theorizing: Perspectives on Globalization and Global Governance (in English)

Mayntz's critical review article on the mechanisms literature appeared in 2004 in the Philosophy of the Social Sciences, and is available online here.

Also worth mentioning is recent work by Petri Ylikoski, including his excellent University of Helsinki 2001 dissertation, Understanding Interests and Causal Explanation (link). The dissertation is available online and provides an excellent basis for understanding many of the issues concerning causal explanation as they arise within the analytical sociology framework.

Each of these theorists relates directly or indirectly to the framework of analytical sociology and usually to Peter Hedstrom's group directly. Barbera was a visiting fellow at Nuffield College, Oxford, where he worked closely with Hedstrom. Schmid demonstrates a close knowledge of Hedstrom's work and of the analytical sociology perspective more generally, and Hedstrom is one of the philosophers he focuses on in his book (3.6). Schmid also has sections on Mayntz, Boudon, and Esser, key figures in the literature of analytical sociology. Ylikoski has published co-authored papers with Hedstrom following the completion of his dissertation.

Causal-mechanisms theory in Europe

The causal-mechanisms theory of social explanation has been influential throughout an extensive network of European philosophers and social scientists, often with a pretty direct connection to the analytical sociology research programme. Peter Hedstrom and his research network are particularly influential in this spread of ideas. It is worth mentioning a couple of books in the past ten years that have brought this approach to non-English speakers.

Philosopher Michael Schmid published Die Logik mechanismischer Erklärungen (The Logic of Mechanistic Explanation) in 2006. This appears to be the first full-length consideration of the "social mechanisms" theory of social explanation in German, and it is an impressive volume. Schmid also has an extensive chapter in English in Peter Demeulenaere's fine collection, Analytical Sociology and Social Mechanisms.

Schmid's book consists of careful analytical expositions of the theories of a dozen social scientists and philosophers who have advocated for this approach to social explanation, including both current and past proponents. Here is the table of contents, in my own non-expert translation, which gives an idea of the topics and authors Schmid concentrates on.

Michael Schmid, Die Logik Mechanismischer Erklärungen

1. The logic of sociological explanation

2. Philosophical foundations for an explanatory sociology

2.1 Mechanisms and the "Theory of complex phenomena" (Friedrich A. von Hayek)
2.2 Causality, social system, and mechanistic explanation (Mario Bunge)
2.3 Microfoundations and causal mechanisms (Daniel Little)

3. Mechanisms in sociological theory

3.1 Individual decisions and structural selection (Robert Merton)
3.2 Individual rationality and the interdependence of action (James S. Coleman)
3.3 Bridge principles and the transformation problem (Siegwart Lindenberg and Reinhard Wippler)
3.4 Macro-social phenomena and "rationality située" (Raymond Boudon)
3.5 Generative structuralism and generative mechanisms (Thomas J.Fararo)
3.6 Social mechanisms and the theory of rational decision-making (Peter Hedstrom and Richard Swedberg)
3.7 Process mechanisms and causal reconstruction (Renate Mayntz)
3.8 "Generative mechanisms" and "structural models" (Hartmut Esser)

4.0 The research heuristic of mechanismic explanation

Many of these authors considered here are core to the analytical sociology framework, including especially Merton, Coleman, Boudon, Hedstrom, Swedberg, Mayntz, and Esser.

A second relevant book appeared in 2004 in Italian. This is Filippo Barbera's Meccanismi sociali: Elementi di sociologia analitica. As the title indicates, the book provides a programatic introduction to the social mechanisms approach as expressed within the analytical sociology framework. The contents are descriptive of the focus of the book (again, in my non-expert translation).

Filippo Barbera, Meccanismi sociali

Introduction

I. Social mechanisms: history, authors, and objectives

I.1 Introduction
I.2 The Columbia School
I.3 Social mechanisms, theory of action and the crisis of the deterministic paradigm
Summary

II. Analytical sociology in the contemporary scene

II.1 Introduction
II.2 The relation between social theory and empirical research
II.3 Three principles for analytical sociology: causal processes, multi-level schemata, and formal theory
Summary

III. From macro to micro: the logic of the situation

III.1 Introduction
III.2 Interdependence between states: Sour Grapes and Ulysses and the Sirens
III.4 Institutional environments, exchange, and preferences
III.5 Training opportunities
III.6 Effect of social interaction
III.7 Structural effect
Summary

IV. The micro-micro axis: the principle of social action and rationality

IV.1 Introduction
IV.2 The forward-looking model
IV.3 The backward-looking model
IV.4 The cognitive model and framing
Summary

V. From micro to macro: aggregation and emergent effects

V.1 Introduction
V.2 Microfoundations of emergent effects
V.3 Strategic interdependency
V.4 Processual interdependence
V.5 Relational and spatial interdependence
V.6 Dynamic analysis of micro and macro
Summary

VI. Mechanisms in empirical research
VI.1 Introduction
VI.2 The diffusion of pharmacological innovation
VI.3 Individual educational choices
VI.4 Collective violence
Summary

VII. The integration of theory and social research

VII.1 Introduction
VII.2 Building the phenomena to be explained
VII.3 Postulating the generative mechanism
VII.4 Testing the mechanism
Summary

Here is a translation of a few lines from the introduction:

This book presents a theoretical perspective and empirical research that have gained growing acceptance in contemporary sociology. Many terms have been used to identify this perspective: "explanation by social or generative mechanisms", "sociological analysis", "sociology of causal processes", and "analytical sociology". Here we will use each of these expressions interchangeably. The book aims to rebuild from within the core of analytical sociology by isolating the principles and objectives shared, without carrying out a systematic comparison with other trends in contemporary sociology. This systematization had to first try to reduce the heterogeneity that characterizes the internal perspective of the social mechanisms approach, but not completely undo the specificities of the individual authors and the different proposals they put forward. The priority attention given to the objectives of clarification and synthesis of a complex and heterogeneous field has had to overshadow the critical evaluation of analytical sociology. This critical evaluation, incidentally, is not entirely absent, and in any case is made more simple after we have specified the conditions and objectives of the approach. (7)

German philosopher Renate Mayntz also takes up issues on mechanistic explanation in the social sciences. Her 2009 book, Sozialwissenschaftliches Erklären, is a volume of essays on the philosophy of social science and social science methodology that address issues about mechanisms as well as the macro-micro link. Here is a rough translation of the table of contents:

Renate Mayntz, Sozialwissenschaftliches Erklären

1. Social science knowledge interests and cognitive capabilities: An Introduction
2. Research methods and cognitive potential: natural and social sciences in comparison
3. Invitation to shadow boxing: sociology and modern biology

4. Rationality in Social Science Perspective
5. Causal reconstruction: theoretical statements in actor-centered institutionalism
6. Social mechanisms in the analysis of social macro-phenomena
7. Individual action and social events: The micro-macro problem in social science
8. Emergence in Philosophy and Social Theory (in English)
9. Embedded Theorizing: Perspectives on Globalization and Global Governance (in English)

Mayntz's critical review article on the mechanisms literature appeared in 2004 in the Philosophy of the Social Sciences, and is available online here.

Also worth mentioning is recent work by Petri Ylikoski, including his excellent University of Helsinki 2001 dissertation, Understanding Interests and Causal Explanation (link). The dissertation is available online and provides an excellent basis for understanding many of the issues concerning causal explanation as they arise within the analytical sociology framework.

Each of these theorists relates directly or indirectly to the framework of analytical sociology and usually to Peter Hedstrom's group directly. Barbera was a visiting fellow at Nuffield College, Oxford, where he worked closely with Hedstrom. Schmid demonstrates a close knowledge of Hedstrom's work and of the analytical sociology perspective more generally, and Hedstrom is one of the philosophers he focuses on in his book (3.6). Schmid also has sections on Mayntz, Boudon, and Esser, key figures in the literature of analytical sociology. Ylikoski has published co-authored papers with Hedstrom following the completion of his dissertation.

Causal-mechanisms theory in Europe

The causal-mechanisms theory of social explanation has been influential throughout an extensive network of European philosophers and social scientists, often with a pretty direct connection to the analytical sociology research programme. Peter Hedstrom and his research network are particularly influential in this spread of ideas. It is worth mentioning a couple of books in the past ten years that have brought this approach to non-English speakers.

Philosopher Michael Schmid published Die Logik mechanismischer Erklärungen (The Logic of Mechanistic Explanation) in 2006. This appears to be the first full-length consideration of the "social mechanisms" theory of social explanation in German, and it is an impressive volume. Schmid also has an extensive chapter in English in Peter Demeulenaere's fine collection, Analytical Sociology and Social Mechanisms.

Schmid's book consists of careful analytical expositions of the theories of a dozen social scientists and philosophers who have advocated for this approach to social explanation, including both current and past proponents. Here is the table of contents, in my own non-expert translation, which gives an idea of the topics and authors Schmid concentrates on.

Michael Schmid, Die Logik Mechanismischer Erklärungen

1. The logic of sociological explanation

2. Philosophical foundations for an explanatory sociology

2.1 Mechanisms and the "Theory of complex phenomena" (Friedrich A. von Hayek)
2.2 Causality, social system, and mechanistic explanation (Mario Bunge)
2.3 Microfoundations and causal mechanisms (Daniel Little)

3. Mechanisms in sociological theory

3.1 Individual decisions and structural selection (Robert Merton)
3.2 Individual rationality and the interdependence of action (James S. Coleman)
3.3 Bridge principles and the transformation problem (Siegwart Lindenberg and Reinhard Wippler)
3.4 Macro-social phenomena and "rationality située" (Raymond Boudon)
3.5 Generative structuralism and generative mechanisms (Thomas J.Fararo)
3.6 Social mechanisms and the theory of rational decision-making (Peter Hedstrom and Richard Swedberg)
3.7 Process mechanisms and causal reconstruction (Renate Mayntz)
3.8 "Generative mechanisms" and "structural models" (Hartmut Esser)

4.0 The research heuristic of mechanismic explanation

Many of these authors considered here are core to the analytical sociology framework, including especially Merton, Coleman, Boudon, Hedstrom, Swedberg, Mayntz, and Esser.

A second relevant book appeared in 2004 in Italian. This is Filippo Barbera's Meccanismi sociali: Elementi di sociologia analitica. As the title indicates, the book provides a programatic introduction to the social mechanisms approach as expressed within the analytical sociology framework. The contents are descriptive of the focus of the book (again, in my non-expert translation).

Filippo Barbera, Meccanismi sociali

Introduction

I. Social mechanisms: history, authors, and objectives

I.1 Introduction
I.2 The Columbia School
I.3 Social mechanisms, theory of action and the crisis of the deterministic paradigm
Summary

II. Analytical sociology in the contemporary scene

II.1 Introduction
II.2 The relation between social theory and empirical research
II.3 Three principles for analytical sociology: causal processes, multi-level schemata, and formal theory
Summary

III. From macro to micro: the logic of the situation

III.1 Introduction
III.2 Interdependence between states: Sour Grapes and Ulysses and the Sirens
III.4 Institutional environments, exchange, and preferences
III.5 Training opportunities
III.6 Effect of social interaction
III.7 Structural effect
Summary

IV. The micro-micro axis: the principle of social action and rationality

IV.1 Introduction
IV.2 The forward-looking model
IV.3 The backward-looking model
IV.4 The cognitive model and framing
Summary

V. From micro to macro: aggregation and emergent effects

V.1 Introduction
V.2 Microfoundations of emergent effects
V.3 Strategic interdependency
V.4 Processual interdependence
V.5 Relational and spatial interdependence
V.6 Dynamic analysis of micro and macro
Summary

VI. Mechanisms in empirical research
VI.1 Introduction
VI.2 The diffusion of pharmacological innovation
VI.3 Individual educational choices
VI.4 Collective violence
Summary

VII. The integration of theory and social research

VII.1 Introduction
VII.2 Building the phenomena to be explained
VII.3 Postulating the generative mechanism
VII.4 Testing the mechanism
Summary

Here is a translation of a few lines from the introduction:

This book presents a theoretical perspective and empirical research that have gained growing acceptance in contemporary sociology. Many terms have been used to identify this perspective: "explanation by social or generative mechanisms", "sociological analysis", "sociology of causal processes", and "analytical sociology". Here we will use each of these expressions interchangeably. The book aims to rebuild from within the core of analytical sociology by isolating the principles and objectives shared, without carrying out a systematic comparison with other trends in contemporary sociology. This systematization had to first try to reduce the heterogeneity that characterizes the internal perspective of the social mechanisms approach, but not completely undo the specificities of the individual authors and the different proposals they put forward. The priority attention given to the objectives of clarification and synthesis of a complex and heterogeneous field has had to overshadow the critical evaluation of analytical sociology. This critical evaluation, incidentally, is not entirely absent, and in any case is made more simple after we have specified the conditions and objectives of the approach. (7)

German philosopher Renate Mayntz also takes up issues on mechanistic explanation in the social sciences. Her 2009 book, Sozialwissenschaftliches Erklären, is a volume of essays on the philosophy of social science and social science methodology that address issues about mechanisms as well as the macro-micro link. Here is a rough translation of the table of contents:

Renate Mayntz, Sozialwissenschaftliches Erklären

1. Social science knowledge interests and cognitive capabilities: An Introduction
2. Research methods and cognitive potential: natural and social sciences in comparison
3. Invitation to shadow boxing: sociology and modern biology

4. Rationality in Social Science Perspective
5. Causal reconstruction: theoretical statements in actor-centered institutionalism
6. Social mechanisms in the analysis of social macro-phenomena
7. Individual action and social events: The micro-macro problem in social science
8. Emergence in Philosophy and Social Theory (in English)
9. Embedded Theorizing: Perspectives on Globalization and Global Governance (in English)

Mayntz's critical review article on the mechanisms literature appeared in 2004 in the Philosophy of the Social Sciences, and is available online here.

Also worth mentioning is recent work by Petri Ylikoski, including his excellent University of Helsinki 2001 dissertation, Understanding Interests and Causal Explanation (link). The dissertation is available online and provides an excellent basis for understanding many of the issues concerning causal explanation as they arise within the analytical sociology framework.

Each of these theorists relates directly or indirectly to the framework of analytical sociology and usually to Peter Hedstrom's group directly. Barbera was a visiting fellow at Nuffield College, Oxford, where he worked closely with Hedstrom. Schmid demonstrates a close knowledge of Hedstrom's work and of the analytical sociology perspective more generally, and Hedstrom is one of the philosophers he focuses on in his book (3.6). Schmid also has sections on Mayntz, Boudon, and Esser, key figures in the literature of analytical sociology. Ylikoski has published co-authored papers with Hedstrom following the completion of his dissertation.

Woodward on mechanisms

Jim Woodward has extended a lot of his philosophical effort towards the task of understanding causation in the sciences (Making Things Happen: A Theory of Causal Explanation). Woodward is a primary exponent of the "manipulationist" theory of causation. He brings a counterfactual orientation to the problem of defining causal relations. If we assert that X caused Y, there is an implication that, if X had not occurred, Y would not have occurred. This implication isn't universally valid, since some events or outcomes are causally overdetermined. (Both X and X' may be a sufficient cause for Y -- in which case removing X still allows for Y through the X' pathway.) Notwithstanding this problem, the counterfactual nature of causal assertions is widely recognized. And this implies the association between causation and intervention or manipulation: if X causes Y, then we should be able to influence the occurrence of Y by manipulating X. This fact in turn underlies the logic of experimental design.

Woodward's treatment of causation deserves fuller treatment than I'll give it here. In this post I will focus on his application of these ideas to the notion of a causal mechanism. He lays this treatment out in a short but influential article, "What is a Mechanism? A Counterfactual Account" (link).

Here is the core idea. He focuses on the Machamer-Darden-Craver (MDC) definition of a causal mechanism (link):

Mechanisms are entities and activities organized such that they are productive of regular changes from start or set-up to finish or termination conditions. (3)

Woodward's contribution is to give greater clarity to the idea of regularity or law by adding the idea of a relationship that is "invariant under intervention". This idea models the notion of experimental testing of a causal hypothesis. We are interested in "X causes Y". We look for interventions that change the state of Y. If we find that the only interventions that change Y, do so through their ability to change X, then the X-Y relation is said to be invariant under intervention, and X is said to cause Y. Here is how he expresses the idea in the article:

I understand this in terms of the notion of invariance under interventions. Suppose that X and Y are variables that can take at least two values. The notion of an intervention attempts to capture, in non-anthropomorphic language that makes no reference to notions like human agency, the conditions that would need to be met in an ideal experimental manipulation of X performed for the purpose of determining whether X causes Y. The intuitive idea is that an intervention on X with respect to Y is a change in the value of X that changes Y, if at all, only via a route that goes through X and not in some other way. This requires, among other things, that the intervention not be correlated with other causes of Y except for those causes of Y (if any) that are causally between X and Y and that the intervention not affect Y independently of X. Thus if A is a common cause of B and S as in the example above, manipulating B by manipulating A will not count as an intervention on B with respect to S since in this case the manipulation affects S via a route (the route that connects A to S ) that does not go through B. (369-70)

Here is how he applies this idea to causal mechanisms. A mechanism consists of separate components that have intervention-invariant relations to separate sets of outcomes. These components are modular: they exercise their influence independently. And, like keys on an accordion, they can be separately activated with discrete results.

So far I have been arguing that components of mechanisms should behave in accord with regularities that are invariant under interventions and support counterfactuals about what would happen in hypothetical experiments. (374)

Here is the proposal all of this leads up to:

(MECH) a necessary condition for a representation to be an acceptable model of a mechanism is that the representation (i) describe an organized or structured set of parts or components, where (ii) the behavior of each component is described by a generalization that is invariant under interventions, and where (iii) the generalizations governing each component are also independently changeable, and where (iv) the representation allows us to see how, in virtue of (i), (ii) and (iii), the overall output of the mechanism will vary under manipulation of the input to each compo- nent and changes in the components themselves. (375)

Woodward illustrates his theory of mechanisms with simple physical and biological examples. How does this theory work when we consider social mechanisms?

What seems most evident is that social mechanisms are not commonly as complex as Woodward's examples would suggest. The sorts of mechanisms that crop up in sociology seem largely to be "simple" mechanisms: they don't consist of multiple independent components leading to an outcome.

Here is the way that McAdam, Tarrow and Tilly (MTT) characterize mechanisms and processes in Dynamics of Contention:

• Mechanisms are a delimited class of events that alter relations among specified sets of elements in identical or closely similar ways over a variety of situations.
• Processes are regular sequences of such mechanisms that produce similar (generally more complex and contingent) transformations of those elements. (24)

These definitions imply that processes are compound, whereas typical mechanisms are simple.

Here are examples that MTT offer of mechanisms:

• resource depletion or enhancement affects people's capacity to engage in contentious politics (25)
• commitment is a widely recurrent individual mechanism in which persons who individually would prefer not to take the risks of collective action find themselves unable to withdraw without hurting others whose solidarity they value (26)
• Brokerage ... as the linking of two or more previously unconnected social sites by a unit that mediates their relations with one another and/or with yet other sites (26)
• Identity shift ... alteration during contentious claim making of public answers to the question: "Who are you?" (27)

In each case we seem to have a simple relationship between one social or environmental fact and a typical outcome -- not a complex concatenation of "cogs and wheels" of social interaction.

So when we consider typical examples of social mechanisms -- free-riding (Olson), escalation (McAdam-Tarrow-Tilly), identity competition (Horowitz) -- we commonly find that they are all basically one-step mechanisms. So the assumption that a mechanism consists of modular components doesn't fit the social sciences well. There are complex social processes, to be sure, but it seems best to understand these as concatenations of distinct mechanisms rather than as a single complex mechanism. (Why? Because they are all too often unrepeatable.)

This doesn't mean that we can't understand social mechanisms along the lines Woodward suggests, if we are content to acknowledge that it is hard to find complex social mechanisms. But in order for even this to be the case, we would have to confirm that these simple mechanisms produce intervention-invariant regularities.

This requirement runs up against a different problem, however. The regularities that correspond to typical social mechanisms are soft regularities, not hard-and-fast laws. Social causation is probabilistic, not deterministic. The regularities corresponding to social causes derive from features of human agency and behavior, and they are deeply exception-laden. The free-rider mechanism tends to give rise to under-investment in the public good -- except when people self-organize, semi-coercive organizations appear, or altruistic religious attitudes take hold. Social mechanisms are productive, in the sense that they "bring about" the associated outcomes. But they are not invariant across all or most cases.

This implies that there are no intervention-invariant relations to be had in the social world. And therefore we need some other analytical foundation if we are to persist in thinking there are social causal mechanisms.

Woodward addresses something very much like this possibility in conjunction with psychological mechanisms. And he draws a prescriptive conclusion: if the "mechanisms" cited in psychology do not have these characteristics of modularity and invariance, then they aren't really mechanisms:

the standard boxological diagrams allegedly describing the operation of psychological mechanisms drawn by psychologists are rarely accompanied by convincing evidence that the parts corresponding to the boxes satisfy the modularity condition described above. If the argument of this paper is correct, this is a reason for being skeptical that these diagrams describe genuine mechanisms. (377)

It seems likely enough that he would reach a similar conclusion about the kinds of mechanisms offered by MTT.

(Here is an excellent review by Michael Strevens of Woodward, Making Things Happen.)

Woodward on mechanisms

Jim Woodward has extended a lot of his philosophical effort towards the task of understanding causation in the sciences (Making Things Happen: A Theory of Causal Explanation). Woodward is a primary exponent of the "manipulationist" theory of causation. He brings a counterfactual orientation to the problem of defining causal relations. If we assert that X caused Y, there is an implication that, if X had not occurred, Y would not have occurred. This implication isn't universally valid, since some events or outcomes are causally overdetermined. (Both X and X' may be a sufficient cause for Y -- in which case removing X still allows for Y through the X' pathway.) Notwithstanding this problem, the counterfactual nature of causal assertions is widely recognized. And this implies the association between causation and intervention or manipulation: if X causes Y, then we should be able to influence the occurrence of Y by manipulating X. This fact in turn underlies the logic of experimental design.

Woodward's treatment of causation deserves fuller treatment than I'll give it here. In this post I will focus on his application of these ideas to the notion of a causal mechanism. He lays this treatment out in a short but influential article, "What is a Mechanism? A Counterfactual Account" (link).

Here is the core idea. He focuses on the Machamer-Darden-Craver (MDC) definition of a causal mechanism (link):

Mechanisms are entities and activities organized such that they are productive of regular changes from start or set-up to finish or termination conditions. (3)

Woodward's contribution is to give greater clarity to the idea of regularity or law by adding the idea of a relationship that is "invariant under intervention". This idea models the notion of experimental testing of a causal hypothesis. We are interested in "X causes Y". We look for interventions that change the state of Y. If we find that the only interventions that change Y, do so through their ability to change X, then the X-Y relation is said to be invariant under intervention, and X is said to cause Y. Here is how he expresses the idea in the article:

I understand this in terms of the notion of invariance under interventions. Suppose that X and Y are variables that can take at least two values. The notion of an intervention attempts to capture, in non-anthropomorphic language that makes no reference to notions like human agency, the conditions that would need to be met in an ideal experimental manipulation of X performed for the purpose of determining whether X causes Y. The intuitive idea is that an intervention on X with respect to Y is a change in the value of X that changes Y, if at all, only via a route that goes through X and not in some other way. This requires, among other things, that the intervention not be correlated with other causes of Y except for those causes of Y (if any) that are causally between X and Y and that the intervention not affect Y independently of X. Thus if A is a common cause of B and S as in the example above, manipulating B by manipulating A will not count as an intervention on B with respect to S since in this case the manipulation affects S via a route (the route that connects A to S ) that does not go through B. (369-70)

Here is how he applies this idea to causal mechanisms. A mechanism consists of separate components that have intervention-invariant relations to separate sets of outcomes. These components are modular: they exercise their influence independently. And, like keys on an accordion, they can be separately activated with discrete results.

So far I have been arguing that components of mechanisms should behave in accord with regularities that are invariant under interventions and support counterfactuals about what would happen in hypothetical experiments. (374)

Here is the proposal all of this leads up to:

(MECH) a necessary condition for a representation to be an acceptable model of a mechanism is that the representation (i) describe an organized or structured set of parts or components, where (ii) the behavior of each component is described by a generalization that is invariant under interventions, and where (iii) the generalizations governing each component are also independently changeable, and where (iv) the representation allows us to see how, in virtue of (i), (ii) and (iii), the overall output of the mechanism will vary under manipulation of the input to each compo- nent and changes in the components themselves. (375)

Woodward illustrates his theory of mechanisms with simple physical and biological examples. How does this theory work when we consider social mechanisms?

What seems most evident is that social mechanisms are not commonly as complex as Woodward's examples would suggest. The sorts of mechanisms that crop up in sociology seem largely to be "simple" mechanisms: they don't consist of multiple independent components leading to an outcome.

Here is the way that McAdam, Tarrow and Tilly (MTT) characterize mechanisms and processes in Dynamics of Contention:

• Mechanisms are a delimited class of events that alter relations among specified sets of elements in identical or closely similar ways over a variety of situations.
• Processes are regular sequences of such mechanisms that produce similar (generally more complex and contingent) transformations of those elements. (24)

These definitions imply that processes are compound, whereas typical mechanisms are simple.

Here are examples that MTT offer of mechanisms:

• resource depletion or enhancement affects people's capacity to engage in contentious politics (25)
• commitment is a widely recurrent individual mechanism in which persons who individually would prefer not to take the risks of collective action find themselves unable to withdraw without hurting others whose solidarity they value (26)
• Brokerage ... as the linking of two or more previously unconnected social sites by a unit that mediates their relations with one another and/or with yet other sites (26)
• Identity shift ... alteration during contentious claim making of public answers to the question: "Who are you?" (27)

In each case we seem to have a simple relationship between one social or environmental fact and a typical outcome -- not a complex concatenation of "cogs and wheels" of social interaction.

So when we consider typical examples of social mechanisms -- free-riding (Olson), escalation (McAdam-Tarrow-Tilly), identity competition (Horowitz) -- we commonly find that they are all basically one-step mechanisms. So the assumption that a mechanism consists of modular components doesn't fit the social sciences well. There are complex social processes, to be sure, but it seems best to understand these as concatenations of distinct mechanisms rather than as a single complex mechanism. (Why? Because they are all too often unrepeatable.)

This doesn't mean that we can't understand social mechanisms along the lines Woodward suggests, if we are content to acknowledge that it is hard to find complex social mechanisms. But in order for even this to be the case, we would have to confirm that these simple mechanisms produce intervention-invariant regularities.

This requirement runs up against a different problem, however. The regularities that correspond to typical social mechanisms are soft regularities, not hard-and-fast laws. Social causation is probabilistic, not deterministic. The regularities corresponding to social causes derive from features of human agency and behavior, and they are deeply exception-laden. The free-rider mechanism tends to give rise to under-investment in the public good -- except when people self-organize, semi-coercive organizations appear, or altruistic religious attitudes take hold. Social mechanisms are productive, in the sense that they "bring about" the associated outcomes. But they are not invariant across all or most cases.

This implies that there are no intervention-invariant relations to be had in the social world. And therefore we need some other analytical foundation if we are to persist in thinking there are social causal mechanisms.

Woodward addresses something very much like this possibility in conjunction with psychological mechanisms. And he draws a prescriptive conclusion: if the "mechanisms" cited in psychology do not have these characteristics of modularity and invariance, then they aren't really mechanisms:

the standard boxological diagrams allegedly describing the operation of psychological mechanisms drawn by psychologists are rarely accompanied by convincing evidence that the parts corresponding to the boxes satisfy the modularity condition described above. If the argument of this paper is correct, this is a reason for being skeptical that these diagrams describe genuine mechanisms. (377)

It seems likely enough that he would reach a similar conclusion about the kinds of mechanisms offered by MTT.

(Here is an excellent review by Michael Strevens of Woodward, Making Things Happen.)

Woodward on mechanisms

Jim Woodward has extended a lot of his philosophical effort towards the task of understanding causation in the sciences (Making Things Happen: A Theory of Causal Explanation). Woodward is a primary exponent of the "manipulationist" theory of causation. He brings a counterfactual orientation to the problem of defining causal relations. If we assert that X caused Y, there is an implication that, if X had not occurred, Y would not have occurred. This implication isn't universally valid, since some events or outcomes are causally overdetermined. (Both X and X' may be a sufficient cause for Y -- in which case removing X still allows for Y through the X' pathway.) Notwithstanding this problem, the counterfactual nature of causal assertions is widely recognized. And this implies the association between causation and intervention or manipulation: if X causes Y, then we should be able to influence the occurrence of Y by manipulating X. This fact in turn underlies the logic of experimental design.

Woodward's treatment of causation deserves fuller treatment than I'll give it here. In this post I will focus on his application of these ideas to the notion of a causal mechanism. He lays this treatment out in a short but influential article, "What is a Mechanism? A Counterfactual Account" (link).

Here is the core idea. He focuses on the Machamer-Darden-Craver (MDC) definition of a causal mechanism (link):

Mechanisms are entities and activities organized such that they are productive of regular changes from start or set-up to finish or termination conditions. (3)

Woodward's contribution is to give greater clarity to the idea of regularity or law by adding the idea of a relationship that is "invariant under intervention". This idea models the notion of experimental testing of a causal hypothesis. We are interested in "X causes Y". We look for interventions that change the state of Y. If we find that the only interventions that change Y, do so through their ability to change X, then the X-Y relation is said to be invariant under intervention, and X is said to cause Y. Here is how he expresses the idea in the article:

I understand this in terms of the notion of invariance under interventions. Suppose that X and Y are variables that can take at least two values. The notion of an intervention attempts to capture, in non-anthropomorphic language that makes no reference to notions like human agency, the conditions that would need to be met in an ideal experimental manipulation of X performed for the purpose of determining whether X causes Y. The intuitive idea is that an intervention on X with respect to Y is a change in the value of X that changes Y, if at all, only via a route that goes through X and not in some other way. This requires, among other things, that the intervention not be correlated with other causes of Y except for those causes of Y (if any) that are causally between X and Y and that the intervention not affect Y independently of X. Thus if A is a common cause of B and S as in the example above, manipulating B by manipulating A will not count as an intervention on B with respect to S since in this case the manipulation affects S via a route (the route that connects A to S ) that does not go through B. (369-70)

Here is how he applies this idea to causal mechanisms. A mechanism consists of separate components that have intervention-invariant relations to separate sets of outcomes. These components are modular: they exercise their influence independently. And, like keys on an accordion, they can be separately activated with discrete results.

So far I have been arguing that components of mechanisms should behave in accord with regularities that are invariant under interventions and support counterfactuals about what would happen in hypothetical experiments. (374)

Here is the proposal all of this leads up to:

(MECH) a necessary condition for a representation to be an acceptable model of a mechanism is that the representation (i) describe an organized or structured set of parts or components, where (ii) the behavior of each component is described by a generalization that is invariant under interventions, and where (iii) the generalizations governing each component are also independently changeable, and where (iv) the representation allows us to see how, in virtue of (i), (ii) and (iii), the overall output of the mechanism will vary under manipulation of the input to each compo- nent and changes in the components themselves. (375)

Woodward illustrates his theory of mechanisms with simple physical and biological examples. How does this theory work when we consider social mechanisms?

What seems most evident is that social mechanisms are not commonly as complex as Woodward's examples would suggest. The sorts of mechanisms that crop up in sociology seem largely to be "simple" mechanisms: they don't consist of multiple independent components leading to an outcome.

Here is the way that McAdam, Tarrow and Tilly (MTT) characterize mechanisms and processes in Dynamics of Contention:

• Mechanisms are a delimited class of events that alter relations among specified sets of elements in identical or closely similar ways over a variety of situations.
• Processes are regular sequences of such mechanisms that produce similar (generally more complex and contingent) transformations of those elements. (24)

These definitions imply that processes are compound, whereas typical mechanisms are simple.

Here are examples that MTT offer of mechanisms:

• resource depletion or enhancement affects people's capacity to engage in contentious politics (25)
• commitment is a widely recurrent individual mechanism in which persons who individually would prefer not to take the risks of collective action find themselves unable to withdraw without hurting others whose solidarity they value (26)
• Brokerage ... as the linking of two or more previously unconnected social sites by a unit that mediates their relations with one another and/or with yet other sites (26)
• Identity shift ... alteration during contentious claim making of public answers to the question: "Who are you?" (27)

In each case we seem to have a simple relationship between one social or environmental fact and a typical outcome -- not a complex concatenation of "cogs and wheels" of social interaction.

So when we consider typical examples of social mechanisms -- free-riding (Olson), escalation (McAdam-Tarrow-Tilly), identity competition (Horowitz) -- we commonly find that they are all basically one-step mechanisms. So the assumption that a mechanism consists of modular components doesn't fit the social sciences well. There are complex social processes, to be sure, but it seems best to understand these as concatenations of distinct mechanisms rather than as a single complex mechanism. (Why? Because they are all too often unrepeatable.)

This doesn't mean that we can't understand social mechanisms along the lines Woodward suggests, if we are content to acknowledge that it is hard to find complex social mechanisms. But in order for even this to be the case, we would have to confirm that these simple mechanisms produce intervention-invariant regularities.

This requirement runs up against a different problem, however. The regularities that correspond to typical social mechanisms are soft regularities, not hard-and-fast laws. Social causation is probabilistic, not deterministic. The regularities corresponding to social causes derive from features of human agency and behavior, and they are deeply exception-laden. The free-rider mechanism tends to give rise to under-investment in the public good -- except when people self-organize, semi-coercive organizations appear, or altruistic religious attitudes take hold. Social mechanisms are productive, in the sense that they "bring about" the associated outcomes. But they are not invariant across all or most cases.

This implies that there are no intervention-invariant relations to be had in the social world. And therefore we need some other analytical foundation if we are to persist in thinking there are social causal mechanisms.

Woodward addresses something very much like this possibility in conjunction with psychological mechanisms. And he draws a prescriptive conclusion: if the "mechanisms" cited in psychology do not have these characteristics of modularity and invariance, then they aren't really mechanisms:

the standard boxological diagrams allegedly describing the operation of psychological mechanisms drawn by psychologists are rarely accompanied by convincing evidence that the parts corresponding to the boxes satisfy the modularity condition described above. If the argument of this paper is correct, this is a reason for being skeptical that these diagrams describe genuine mechanisms. (377)

It seems likely enough that he would reach a similar conclusion about the kinds of mechanisms offered by MTT.

(Here is an excellent review by Michael Strevens of Woodward, Making Things Happen.)

Dissecting the social

The past dozen years or so have witnessed the emergence of a distinctive approach to the social sciences that its practitioners refer to as "analytical sociology." Peter Hedström's Dissecting the Social: On the Principles of Analytical Sociology (2005) serves as a manifesto for the approach, and Pierre Demeulenaere, ed., Analytical Sociology and Social Mechanisms, and Peter Hedström and Peter Bearman, eds., The Oxford Handbook of Analytical Sociology provide substantive foundations for several areas of research within this approach.  And the European Network of Analytical Sociologists provides an institutional framework within which research approaches and findings can be shared (link).

Hedström describes the analytical sociology approach in these terms:

Although the term analytical sociology is not commonly used, the type of sociology designated by the term has an important history that can be traced back to the works of late nineteenth- and early twentieth-century sociologists such as Max Weber and Alexis de Tocqueville, and to prominent mid-twentieth-century sociologists such as the early Talcott Parsons and Robert K. Merton. Among contemporary social scientists, four in particular have profoundly influenced the analytical approach.  They are Jon Elster, Raymond Boudon, Thomas Schelling and James Coleman. (kl 113)

One important characteristic of the analytical approach is that it aims to gain understanding by dissecting the social phenomena to be explained.  To dissect, as the term is used here, is to decompose a complex totality into its constituent entities and activities and then to bring into focus what is believed to be its most essential elements. (kl 65)

And here is how Hedström and Bearman describe the approach in the Handbook:

Analytical sociology is concerned first and foremost with explaining important social facts such as network structures, patterns of residential segregation, typical beliefs, cultural tastes, common ways of acting, and so forth. It explains such facts not merely by relating them to other social facts -- an exercise that does not provide an explanation -- but by detailing in clear and precise ways the mechanisms through which the social facts under consideration are brought about.  In short, analytical sociology is a strategy for understanding the social world. (3-4)

Two interrelated aspects are of particular importance: the explanatory principles guiding the approach and the type of explanatory factors being evoked. Analytical sociology explains by detailing mechanisms through which social facts are brought about, and these mechanisms invariably refer to individuals' actions and the relations that link actors to one another. (4)

In my assessment, AS rests on three central ideas.

First, there is the idea that social outcomes need to be explained on the basis of the actions of individuals.  This position is referred to variously as methodological individualism, methodological localism, or microfoundationalism.  It is often illustrated by reference to "Coleman's Boat" in James Coleman, Foundations of Social Theory (1994:8) describing the relationship that ought to exist between macro and micro social phenomena:

The diagram indicates the relationship between macro-factors (Protestant religious doctrine, capitalism) and the micro factors that underlie their causal relation (values, economic behavior).  Here are a few of Hedström's formulations of this ontological position:

In sociological inquiries, however, the core entity always tends to be the actors in the social system being analyzed, and the core activity tends to be the actions of these actors. (kl 106)

To be explanatory a theory must specify the set of causal mechanisms that are likely to have brought about the change, and this requires one to demonstrate how macro states at one point in time influence individuals' actions, and how these actions bring about new macro states at a later point in time. (kl 143)

Further, Hedström is drawn to a broad version of rational-choice theory -- what he calls the "Desire-Belief-Opportunity theory".

Desires (D), beliefs (B) and opportunities (O) are the primary theoretical terms upon which the analysis of action and interaction will be based.  ... The desires, beliefs and opportunities of an actor are here seen as the proximate causes of the actor's action. (kl 507)

This is a variant of rational choice theory, because the actor's choice is interpreted along these lines: given the desires the actor possesses, given the beliefs he/she has about the environment of choice, and given the opportunities he/she confronts, action A is a sensible way of satisfying the desires. It is worth pointing out that it is possible to be microfoundationalist about macro outcomes while not assuming that individual actions are driven by rational calculations. Microfoundationalism is distinct from the assumption of individual rationality.

Second is the idea that social actors are socially situated and socially constructed; the values, perceptions, emotions, and modes of reasoning of the actor are influenced by social institutions, and their current behavior is constrained and incented by existing institutions. (This position has a lot in common with the methodological localism that I've defended.) Practitioners of analytical sociology are not reductionist about social behavior, at least in the way that economists tend to be; they want to leave room conceptually for the observation that social structures and norms influence individual behavior and that individuals are not unadorned utility maximizers. (Gary Becker's effort to explain much of social life on the basis of the premise of maximizing utility is an example of the reductionist tendency of purist rational choice theory; Uncommon Sense: Economic Insights, from Marriage to Terrorism.) In the Hedström-Bearman introduction to the Handbook they put the point this way:

Structural individualism is a methodological doctrine according to which social facts should be explained as the intended or unintended outcomes of individuals' actions. Structural individualism differs from traditional methodological individualism in attributing substantial explanatory importance to the social structures in which individuals are embedded. (4)

This is a direction of thought that is not well advanced within analytical sociology, but would repay further research.  There is no reason why a microfoundational approach should not take seriously the causal dynamics of identity formation and the formation of the individual's cognitive, practical, and emotional frameworks.  These are relevant to behavior, and they are plainly driven by concrete social processes and institutions.

Third, and most distinctive, is the idea that social explanations need to be grounded in a hypothesis about the concrete social causal mechanisms that constitute the causal connection between one event and another. Mechanisms rather than regularities or necessary/sufficient conditions provide the fundamental grounding of causal relations and need to be at the center of causal research.  (This is a position developed and discussed many times in this blog; thread.) This approach has several intellectual foundations, but one is the tradition of critical realism and some of the ideas developed by Roy Bhaskar (A Realist Theory of Science). Hedström advocates for a theory of causal explanation that is grounded in the idea of a causal mechanism:

The position taken here, rather, is that mechanism-based explanations are the most appropriate type of explanations for the social sciences.  The core idea behind the mechanism approach is that we explain a social phenomenon by referring to a constellation of entities and activities, typically actors and their actions, that are linked to one another in such a way that they regularly bring about the type of phenomenon we seek to explain. (kl 65)

A social mechanism, as defined here, is a constellation of entities and activities that are linked to one another in such a way that they regularly bring about a particular type of outcome. (kl 181)

In addition to these three orienting frameworks for analytical sociology, there is a fourth characteristic that should be mentioned.  This is the idea that the tools of computer-based simulation of the aggregate consequences of individual behavior can be a very powerful tool for sociological research and explanation.  So the tools of agent-based modeling and other simulations of complex systems have a very natural place within the armoire of analytical sociology.

In short, analytical sociology is a compact, clear approach to the problem of understanding social outcomes.  It lays the ground for the productive body of research questions associated with the "aggregation dynamics" research program (link).  There is active, innovative research being done within this framework of ideas, especially in Germany, Sweden, and Great Britain.  And its clarity permits, in turn, the formulation of rather specific critiques from researchers in other sociological traditions who reject one or another of the key components.  (This is the thrust of Andrew Abbott's article on mechanisms, discussed previously.)

(An earlier post described John Levi Martin's effort to show how social structures come to be as the result of the accretion of patterns of individual social interaction.  Where Levi Martin proceeds from micro to macro through aggregation, Hedström proceeds from macro to micro through disaggregation (or dissection, in his words). But both are fundamentally interested in analyzing the micro-macro link.)

Dissecting the social

The past dozen years or so have witnessed the emergence of a distinctive approach to the social sciences that its practitioners refer to as "analytical sociology." Peter Hedström's Dissecting the Social: On the Principles of Analytical Sociology (2005) serves as a manifesto for the approach, and Pierre Demeulenaere, ed., Analytical Sociology and Social Mechanisms, and Peter Hedström and Peter Bearman, eds., The Oxford Handbook of Analytical Sociology provide substantive foundations for several areas of research within this approach.  And the European Network of Analytical Sociologists provides an institutional framework within which research approaches and findings can be shared (link).

Hedström describes the analytical sociology approach in these terms:

Although the term analytical sociology is not commonly used, the type of sociology designated by the term has an important history that can be traced back to the works of late nineteenth- and early twentieth-century sociologists such as Max Weber and Alexis de Tocqueville, and to prominent mid-twentieth-century sociologists such as the early Talcott Parsons and Robert K. Merton. Among contemporary social scientists, four in particular have profoundly influenced the analytical approach.  They are Jon Elster, Raymond Boudon, Thomas Schelling and James Coleman. (kl 113)

One important characteristic of the analytical approach is that it aims to gain understanding by dissecting the social phenomena to be explained.  To dissect, as the term is used here, is to decompose a complex totality into its constituent entities and activities and then to bring into focus what is believed to be its most essential elements. (kl 65)

And here is how Hedström and Bearman describe the approach in the Handbook:

Analytical sociology is concerned first and foremost with explaining important social facts such as network structures, patterns of residential segregation, typical beliefs, cultural tastes, common ways of acting, and so forth. It explains such facts not merely by relating them to other social facts -- an exercise that does not provide an explanation -- but by detailing in clear and precise ways the mechanisms through which the social facts under consideration are brought about.  In short, analytical sociology is a strategy for understanding the social world. (3-4)

Two interrelated aspects are of particular importance: the explanatory principles guiding the approach and the type of explanatory factors being evoked. Analytical sociology explains by detailing mechanisms through which social facts are brought about, and these mechanisms invariably refer to individuals' actions and the relations that link actors to one another. (4)

In my assessment, AS rests on three central ideas.

First, there is the idea that social outcomes need to be explained on the basis of the actions of individuals.  This position is referred to variously as methodological individualism, methodological localism, or microfoundationalism.  It is often illustrated by reference to "Coleman's Boat" in James Coleman, Foundations of Social Theory (1994:8) describing the relationship that ought to exist between macro and micro social phenomena:

The diagram indicates the relationship between macro-factors (Protestant religious doctrine, capitalism) and the micro factors that underlie their causal relation (values, economic behavior).  Here are a few of Hedström's formulations of this ontological position:

In sociological inquiries, however, the core entity always tends to be the actors in the social system being analyzed, and the core activity tends to be the actions of these actors. (kl 106)

To be explanatory a theory must specify the set of causal mechanisms that are likely to have brought about the change, and this requires one to demonstrate how macro states at one point in time influence individuals' actions, and how these actions bring about new macro states at a later point in time. (kl 143)

Further, Hedström is drawn to a broad version of rational-choice theory -- what he calls the "Desire-Belief-Opportunity theory".

Desires (D), beliefs (B) and opportunities (O) are the primary theoretical terms upon which the analysis of action and interaction will be based.  ... The desires, beliefs and opportunities of an actor are here seen as the proximate causes of the actor's action. (kl 507)

This is a variant of rational choice theory, because the actor's choice is interpreted along these lines: given the desires the actor possesses, given the beliefs he/she has about the environment of choice, and given the opportunities he/she confronts, action A is a sensible way of satisfying the desires. It is worth pointing out that it is possible to be microfoundationalist about macro outcomes while not assuming that individual actions are driven by rational calculations. Microfoundationalism is distinct from the assumption of individual rationality.

Second is the idea that social actors are socially situated and socially constructed; the values, perceptions, emotions, and modes of reasoning of the actor are influenced by social institutions, and their current behavior is constrained and incented by existing institutions. (This position has a lot in common with the methodological localism that I've defended.) Practitioners of analytical sociology are not reductionist about social behavior, at least in the way that economists tend to be; they want to leave room conceptually for the observation that social structures and norms influence individual behavior and that individuals are not unadorned utility maximizers. (Gary Becker's effort to explain much of social life on the basis of the premise of maximizing utility is an example of the reductionist tendency of purist rational choice theory; Uncommon Sense: Economic Insights, from Marriage to Terrorism.) In the Hedström-Bearman introduction to the Handbook they put the point this way:

Structural individualism is a methodological doctrine according to which social facts should be explained as the intended or unintended outcomes of individuals' actions. Structural individualism differs from traditional methodological individualism in attributing substantial explanatory importance to the social structures in which individuals are embedded. (4)

This is a direction of thought that is not well advanced within analytical sociology, but would repay further research.  There is no reason why a microfoundational approach should not take seriously the causal dynamics of identity formation and the formation of the individual's cognitive, practical, and emotional frameworks.  These are relevant to behavior, and they are plainly driven by concrete social processes and institutions.

Third, and most distinctive, is the idea that social explanations need to be grounded in a hypothesis about the concrete social causal mechanisms that constitute the causal connection between one event and another. Mechanisms rather than regularities or necessary/sufficient conditions provide the fundamental grounding of causal relations and need to be at the center of causal research.  (This is a position developed and discussed many times in this blog; thread.) This approach has several intellectual foundations, but one is the tradition of critical realism and some of the ideas developed by Roy Bhaskar (A Realist Theory of Science). Hedström advocates for a theory of causal explanation that is grounded in the idea of a causal mechanism:

The position taken here, rather, is that mechanism-based explanations are the most appropriate type of explanations for the social sciences.  The core idea behind the mechanism approach is that we explain a social phenomenon by referring to a constellation of entities and activities, typically actors and their actions, that are linked to one another in such a way that they regularly bring about the type of phenomenon we seek to explain. (kl 65)

A social mechanism, as defined here, is a constellation of entities and activities that are linked to one another in such a way that they regularly bring about a particular type of outcome. (kl 181)

In addition to these three orienting frameworks for analytical sociology, there is a fourth characteristic that should be mentioned.  This is the idea that the tools of computer-based simulation of the aggregate consequences of individual behavior can be a very powerful tool for sociological research and explanation.  So the tools of agent-based modeling and other simulations of complex systems have a very natural place within the armoire of analytical sociology.

In short, analytical sociology is a compact, clear approach to the problem of understanding social outcomes.  It lays the ground for the productive body of research questions associated with the "aggregation dynamics" research program (link).  There is active, innovative research being done within this framework of ideas, especially in Germany, Sweden, and Great Britain.  And its clarity permits, in turn, the formulation of rather specific critiques from researchers in other sociological traditions who reject one or another of the key components.  (This is the thrust of Andrew Abbott's article on mechanisms, discussed previously.)

(An earlier post described John Levi Martin's effort to show how social structures come to be as the result of the accretion of patterns of individual social interaction.  Where Levi Martin proceeds from micro to macro through aggregation, Hedström proceeds from macro to micro through disaggregation (or dissection, in his words). But both are fundamentally interested in analyzing the micro-macro link.)

Dissecting the social

The past dozen years or so have witnessed the emergence of a distinctive approach to the social sciences that its practitioners refer to as "analytical sociology." Peter Hedström's Dissecting the Social: On the Principles of Analytical Sociology (2005) serves as a manifesto for the approach, and Pierre Demeulenaere, ed., Analytical Sociology and Social Mechanisms, and Peter Hedström and Peter Bearman, eds., The Oxford Handbook of Analytical Sociology provide substantive foundations for several areas of research within this approach.  And the European Network of Analytical Sociologists provides an institutional framework within which research approaches and findings can be shared (link).

Hedström describes the analytical sociology approach in these terms:

Although the term analytical sociology is not commonly used, the type of sociology designated by the term has an important history that can be traced back to the works of late nineteenth- and early twentieth-century sociologists such as Max Weber and Alexis de Tocqueville, and to prominent mid-twentieth-century sociologists such as the early Talcott Parsons and Robert K. Merton. Among contemporary social scientists, four in particular have profoundly influenced the analytical approach.  They are Jon Elster, Raymond Boudon, Thomas Schelling and James Coleman. (kl 113)

One important characteristic of the analytical approach is that it aims to gain understanding by dissecting the social phenomena to be explained.  To dissect, as the term is used here, is to decompose a complex totality into its constituent entities and activities and then to bring into focus what is believed to be its most essential elements. (kl 65)

And here is how Hedström and Bearman describe the approach in the Handbook:

Analytical sociology is concerned first and foremost with explaining important social facts such as network structures, patterns of residential segregation, typical beliefs, cultural tastes, common ways of acting, and so forth. It explains such facts not merely by relating them to other social facts -- an exercise that does not provide an explanation -- but by detailing in clear and precise ways the mechanisms through which the social facts under consideration are brought about.  In short, analytical sociology is a strategy for understanding the social world. (3-4)

Two interrelated aspects are of particular importance: the explanatory principles guiding the approach and the type of explanatory factors being evoked. Analytical sociology explains by detailing mechanisms through which social facts are brought about, and these mechanisms invariably refer to individuals' actions and the relations that link actors to one another. (4)

In my assessment, AS rests on three central ideas.

First, there is the idea that social outcomes need to be explained on the basis of the actions of individuals.  This position is referred to variously as methodological individualism, methodological localism, or microfoundationalism.  It is often illustrated by reference to "Coleman's Boat" in James Coleman, Foundations of Social Theory (1994:8) describing the relationship that ought to exist between macro and micro social phenomena:

The diagram indicates the relationship between macro-factors (Protestant religious doctrine, capitalism) and the micro factors that underlie their causal relation (values, economic behavior).  Here are a few of Hedström's formulations of this ontological position:

In sociological inquiries, however, the core entity always tends to be the actors in the social system being analyzed, and the core activity tends to be the actions of these actors. (kl 106)

To be explanatory a theory must specify the set of causal mechanisms that are likely to have brought about the change, and this requires one to demonstrate how macro states at one point in time influence individuals' actions, and how these actions bring about new macro states at a later point in time. (kl 143)

Further, Hedström is drawn to a broad version of rational-choice theory -- what he calls the "Desire-Belief-Opportunity theory".

Desires (D), beliefs (B) and opportunities (O) are the primary theoretical terms upon which the analysis of action and interaction will be based.  ... The desires, beliefs and opportunities of an actor are here seen as the proximate causes of the actor's action. (kl 507)

This is a variant of rational choice theory, because the actor's choice is interpreted along these lines: given the desires the actor possesses, given the beliefs he/she has about the environment of choice, and given the opportunities he/she confronts, action A is a sensible way of satisfying the desires. It is worth pointing out that it is possible to be microfoundationalist about macro outcomes while not assuming that individual actions are driven by rational calculations. Microfoundationalism is distinct from the assumption of individual rationality.

Second is the idea that social actors are socially situated and socially constructed; the values, perceptions, emotions, and modes of reasoning of the actor are influenced by social institutions, and their current behavior is constrained and incented by existing institutions. (This position has a lot in common with the methodological localism that I've defended.) Practitioners of analytical sociology are not reductionist about social behavior, at least in the way that economists tend to be; they want to leave room conceptually for the observation that social structures and norms influence individual behavior and that individuals are not unadorned utility maximizers. (Gary Becker's effort to explain much of social life on the basis of the premise of maximizing utility is an example of the reductionist tendency of purist rational choice theory; Uncommon Sense: Economic Insights, from Marriage to Terrorism.) In the Hedström-Bearman introduction to the Handbook they put the point this way:

Structural individualism is a methodological doctrine according to which social facts should be explained as the intended or unintended outcomes of individuals' actions. Structural individualism differs from traditional methodological individualism in attributing substantial explanatory importance to the social structures in which individuals are embedded. (4)

This is a direction of thought that is not well advanced within analytical sociology, but would repay further research.  There is no reason why a microfoundational approach should not take seriously the causal dynamics of identity formation and the formation of the individual's cognitive, practical, and emotional frameworks.  These are relevant to behavior, and they are plainly driven by concrete social processes and institutions.

Third, and most distinctive, is the idea that social explanations need to be grounded in a hypothesis about the concrete social causal mechanisms that constitute the causal connection between one event and another. Mechanisms rather than regularities or necessary/sufficient conditions provide the fundamental grounding of causal relations and need to be at the center of causal research.  (This is a position developed and discussed many times in this blog; thread.) This approach has several intellectual foundations, but one is the tradition of critical realism and some of the ideas developed by Roy Bhaskar (A Realist Theory of Science). Hedström advocates for a theory of causal explanation that is grounded in the idea of a causal mechanism:

The position taken here, rather, is that mechanism-based explanations are the most appropriate type of explanations for the social sciences.  The core idea behind the mechanism approach is that we explain a social phenomenon by referring to a constellation of entities and activities, typically actors and their actions, that are linked to one another in such a way that they regularly bring about the type of phenomenon we seek to explain. (kl 65)

A social mechanism, as defined here, is a constellation of entities and activities that are linked to one another in such a way that they regularly bring about a particular type of outcome. (kl 181)

In addition to these three orienting frameworks for analytical sociology, there is a fourth characteristic that should be mentioned.  This is the idea that the tools of computer-based simulation of the aggregate consequences of individual behavior can be a very powerful tool for sociological research and explanation.  So the tools of agent-based modeling and other simulations of complex systems have a very natural place within the armoire of analytical sociology.

In short, analytical sociology is a compact, clear approach to the problem of understanding social outcomes.  It lays the ground for the productive body of research questions associated with the "aggregation dynamics" research program (link).  There is active, innovative research being done within this framework of ideas, especially in Germany, Sweden, and Great Britain.  And its clarity permits, in turn, the formulation of rather specific critiques from researchers in other sociological traditions who reject one or another of the key components.  (This is the thrust of Andrew Abbott's article on mechanisms, discussed previously.)

(An earlier post described John Levi Martin's effort to show how social structures come to be as the result of the accretion of patterns of individual social interaction.  Where Levi Martin proceeds from micro to macro through aggregation, Hedström proceeds from macro to micro through disaggregation (or dissection, in his words). But both are fundamentally interested in analyzing the micro-macro link.)