Part 4 built the instruments. Part 5 takes the workshops — the schools that developed them, argued with each other, dominated for a while, and were in turn attacked.

It begins with the one that dominated most completely. For roughly thirty years, from the mid-1930s to the early 1960s, structural functionalism was not a school within American sociology; it was very nearly American sociology. Then it collapsed, and "functionalist" became an insult.

Lesson 4.2.7 established the inheritance from Durkheim. This lesson takes the school on its own terms, as a serious intellectual project — because you cannot understand why it fell without understanding what it was trying to do.

Parsons: the project

The social system

The Social System (1951) is the full statement, and it is famously difficult. Here is the architecture.

The pattern variables

Parsons's most usable contribution, and the part most likely to be still worth your time.

AGIL

The scheme Parsons is best known for and the one that did him most damage.

Go deeper

What Parsons was actually claiming

Two clarifications that the caricature obscures, and that later scholarship has established.

He did not think societies were harmonious. Parsons wrote about deviance, strain, anomie, social change and the sources of conflict. His analysis of Nazi Germany — he wrote a series of essays on it during the war and worked for the US government on postwar planning — is a study of a society tearing itself apart, and it is one of the better contemporary analyses. The charge that he could not see conflict is overstated; the fairer charge is that his framework treated conflict as strain within a system rather than as a constitutive feature of it.

And he did have a theory of change. His later work — Societies: Evolutionary and Comparative Perspectives (1966) and The System of Modern Societies (1971) — developed a theory of evolutionary universals and social differentiation: societies develop by differentiating functions into specialised subsystems, and this increases adaptive capacity. The scheme is stadial in the way 3.3.1 warned about, places modern America at the summit, and has been heavily criticised — but the claim that he had no account of change is simply false.

The intellectual context, which matters

Functionalism's dominance was not purely intellectual, and the sociology of knowledge (5.15) applies to it as much as to anything else.

Institutional position. Parsons was at Harvard, chairing a department that trained a generation. Robert Merton, Kingsley Davis, Wilbert Moore, Marion Levy, Robin Williams, Neil Smelser and Clifford Geertz all passed through. That is a transmission mechanism (4.5.5) operating at full strength.

Funding. Postwar American social science was well resourced by foundations and government, and a theory offering an integrated science of society was attractive to funders.

And the political moment. A framework whose central question is how systems maintain themselves, produced in the most powerful and most self-confident society on earth at the peak of its confidence, is not a coincidence. Alvin Gouldner's The Coming Crisis of Western Sociology (1970) made this argument at length, showing that Parsons's apparently neutral system theory encoded the assumptions of postwar American liberalism — and Gouldner, notably, had been Parsons's student.

This does not refute the theory. Ideas are not false because of who funded them (4.1.7). But it explains the dominance, which is a separate question from the validity, and the dominance is what made the collapse so complete.

Parsons's actual achievements, listed

Because the reaction against him was so total that the achievements are frequently forgotten.

He introduced Weber to American sociology through translation and through The Structure of Social Action.

He posed the problem of double contingency clearly, and it remains a real problem.

The pattern variables are a genuinely useful conceptual instrument and are still in use, often unattributed.

The sick role is a live concept in medical sociology.

The analysis of professions — his account of why professional roles combine affective neutrality, universalism, specificity and collectivity-orientation, and what happens when they do not — remains a standard reference.

The systematic attention to socialisation as the mechanism connecting individual motivation to social requirements.

And the ambition itself. Whatever one thinks of the result, an attempt to construct an integrated conceptual scheme for a whole discipline is a serious undertaking, and no one has attempted it at that scale since.

Why it matters

It is the last attempt at a general theory of society, and understanding why it failed tells you a great deal about what social theory can and cannot do. No one has tried again at that scale, and the question of whether the discipline needs one is still open.

It supplies concepts still in use. Pattern variables, the sick role, double contingency, institutionalisation and internalisation, and the vocabulary of system, role, norm and value that every sociologist uses without attribution.

It is the position everything in Part 5 is reacting to. Conflict theory (5.2), symbolic interactionism (5.4), critical theory (5.5) and Garfinkel's ethnomethodology (2.4.3) each defined themselves partly against it. You cannot read the reactions without knowing what they were reacting to.

And it is a case study in how a theory's political moment shapes its fortunes. Functionalism rose with postwar American confidence and fell with it — which is a finding about the sociology of ideas, and one the theory itself had no way of registering.