A social system, in Talcott Parsons's definition, consists of a plurality of individual actors interacting with one another in a situation which has at least a physical or environmental aspect, actors who are motivated by a tendency to the optimisation of gratification and whose relations to their situation, including each other, are defined and mediated by a system of culturally structured and shared symbols. Stripped of its formality, the claim is that whenever two or more actors interact repeatedly and orient themselves to shared expectations, a system with properties of its own comes into being.

The unit of that system is not the individual but the role — the organised bundle of expectations attached to a position, considered from the standpoint of the system rather than of the person occupying it. Roles combine into status-role complexes, these into collectivities, and collectivities into the institutional order of a society. Parsons's ambition was a single conceptual scheme in which personality, culture and social structure could be described in commensurable terms — what he called the theory of action.

The functional prerequisites

Every system, Parsons argued, must solve four problems if it is to persist. Two concern its relation to the environment and two its internal state; two are instrumental and two consummatory.

Adaptation is the securing and distribution of resources from the environment. Goal attainment is the mobilisation of those resources towards collective ends and the ordering of priorities among them. Integration is the coordination of the parts and the management of conflict between them. Latency, or pattern maintenance and tension management, is the storage and renewal of motivation and the transmission of the value patterns that make the other three possible. The four together are usually cited by their initials.

At the level of a society each prerequisite is met by a specialised subsystem: the economy adapts, the polity attains goals, the institutions of law, community and social control integrate, and the fiduciary complex of family, school and religion handles pattern maintenance. The same fourfold scheme reappears at the level of general action, where the behavioural organism adapts, the personality system pursues goals, the social system integrates, and the cultural system maintains patterns. This recursive quality is what Parsons meant by a general theory: the same analytical grid applies to a household, a hospital and a nation.

Institutionalisation, socialisation and control

What holds a social system together is not force and not calculation but the institutionalisation of value patterns. A value becomes institutionalised when it is simultaneously written into the normative expectations attached to roles and internalised in the need-dispositions of the actors who fill them, so that people want to do what they are obliged to do. Where this coincidence is achieved, conformity is not experienced as constraint.

Two mechanisms sustain it. Socialisation builds the common value system into personality through the family, the peer group, the school and the wider culture, producing actors whose motives already fit their roles. Social control deals with the residue — the deviance that socialisation fails to prevent — through sanctions ranging from mild disapproval to psychiatry and punishment. Parsons treated illness itself as a form of deviance managed by an institutionalised sick role, an example that shows how far he was prepared to extend the apparatus.

Consider a university examination. Its stability rests only marginally on invigilation. Candidates have internalised the value of achievement and the norm of fairness; the examiner's role prescribes impartiality even towards a student he likes; the credential produced feeds the occupational system's need to allocate personnel by performance. Adaptation, goal attainment, integration and pattern maintenance are all visible in a two-hour ritual, and the invigilator represents social control operating on the exceptions.

The cybernetic hierarchy

Parsons's later work arranged the subsystems in a cybernetic hierarchy of control. Systems rich in information and poor in energy control systems rich in energy and poor in information — as a thermostat governs a furnace. Culture, being the most information-rich, stands at the top and conditions nothing but controls much; the physical and organic conditions of life stand at the bottom and control little but condition everything. Between them the social system is controlled from above by values and conditioned from below by resources.

The scheme also generated Parsons's account of exchange. Subsystems trade through generalised media — money in the economy, power in the polity, influence in the integrative subsystem, value commitments in the fiduciary — each circulating like currency and each capable of inflation and deflation. Change enters this picture as moving equilibrium: a system disturbed by innovation or external pressure does not return to its prior state but settles into a new balance, typically through structural differentiation, in which one structure splits into two more specialised ones, followed by adaptive upgrading, inclusion and value generalisation.

Criticisms

The objections are well rehearsed and largely fair. The scheme is charged with over-integration: it assumes a degree of value consensus that no complex society displays, and treats conflict as strain or deviance rather than as a normal product of structure. It is charged with teleology, since explaining an institution by the need it meets implies that systems have purposes and that needs somehow call forth their own satisfaction. Its treatment of change is thin — differentiation describes the direction of change without identifying its causes, and the concept of equilibrium smuggles in the assumption that disruption is abnormal. Alvin Gouldner and C. Wright Mills added the political charge that a theory built around order and legitimation naturalises the existing distribution of advantage, and Ralf Dahrendorf countered with a model in which authority and its contestation, not value integration, are the constants of social life. Power is the notable absence: Parsons treats it as a circulating medium generated by collective goal attainment rather than as a capacity used against others.

What survives the critique is considerable. The vocabulary of role, status, institutionalisation, socialisation, social control and differentiation is now common property. The functional prerequisites remain a serviceable checklist for describing any institution — asking what a hospital or a village panchayat does about resources, goals, coordination and motivation is a productive first question even for an analyst who rejects the theory.

For the UPSC answer

Define the social system in Parsons's own terms — plural actors, a common situation, culturally structured shared symbols — and name the role as its unit before turning to the four prerequisites. Keep the two levels distinct: the four subsystems of a society and the four subsystems of general action are not the same list, and confusing them is the commonest error in scripts. Give the cybernetic hierarchy and moving equilibrium a line each, since they are what allow Parsons to claim a theory of change. Then state the standard criticisms — over-integration, teleology, the missing account of power and change — and close by conceding what remains useful, which shows discrimination rather than a memorised attack.

References & further reading

  1. Parsons, T. (1951). The Social System. Routledge.
  2. Parsons, T. and Shils, E., eds. (1951). Toward a General Theory of Action. Harvard University Press.
  3. Parsons, T. and Smelser, N. (1956). Economy and Society. Routledge.
  4. Parsons, T. (1966). Societies: Evolutionary and Comparative Perspectives. Prentice-Hall.
  5. Gouldner, A. (1970). The Coming Crisis of Western Sociology. Basic Books.
  6. Rocher, G. (1974). Talcott Parsons and American Sociology. Nelson.