Breaking down the question
The question asks how social equilibrium is maintained within Parsons's framework — a "how" question that calls for an explanatory account of the mechanisms, not merely a definition of equilibrium. You must show the moving parts of his system and how they hold society in a state of ordered balance.
Equilibrium, for Parsons, is the tendency of a social system to maintain a stable, integrated relationship among its parts and to return to balance when disturbed. The Parsons social system and pattern variables framework supplies the apparatus: functional prerequisites, the AGIL scheme, socialisation, social control and value consensus.
The best answers treat equilibrium as dynamic rather than static, and close with the standard criticisms — that the model over-stresses order and struggles to explain conflict and change.
How to approach it
Begin by defining the social system and the concept of equilibrium, locating Parsons within the structural-functionalist tradition that treats society as a system of interdependent parts oriented to stability.
Then explain the mechanisms in sequence: the four functional prerequisites captured in the AGIL scheme; the role of shared values and normative consensus in integrating action; socialisation, which internalises norms so that conformity becomes willing; and social control, which manages deviance and restores balance. Show how the pattern variables standardise role expectations.
Close with a critical assessment — the charges of conservatism, tautology and neglect of conflict — and a note that Parsons later tried to accommodate change through his evolutionary theory.
Model answer
Talcott Parsons conceived society as a social system: a set of interdependent parts, held together by shared values, that tends towards equilibrium. Equilibrium is the condition in which the relationships among the system's parts remain stable and integrated, and in which disturbances are absorbed so that the system returns to balance. Maintaining this equilibrium is, for Parsons, the central problem of social order — the Hobbesian question of how orderly social life is possible at all. His answer lies in a set of interlocking mechanisms.
The foundation is the theory of functional prerequisites, summarised in the AGIL scheme. Every social system, to survive and stay in balance, must meet four needs. Adaptation (A) is the securing of resources from the environment, performed chiefly by the economy. Goal attainment (G) is the setting and pursuit of collective goals, performed by the polity. Integration (I) is the coordination of the parts and the management of their relationships, performed by legal and normative institutions. Latency or pattern maintenance (L) is the reproduction of motivation and the transmission of culture, performed by the family, religion and education. When each subsystem discharges its function and exchanges outputs with the others, the system remains in equilibrium; a failure in one generates strain that the others must absorb.
Beneath this institutional architecture lies the deeper integrating force: value consensus. Parsons, drawing on Durkheim, held that a society coheres because its members share a common value system that defines legitimate goals and acceptable means. Shared values are translated into specific norms attached to statuses and roles, so that social interaction becomes patterned and predictable. When actors agree on what is desirable and how it may properly be pursued, their separate actions mesh together rather than collide, and order is sustained without constant coercion.
For consensus to work, values must be lodged inside individuals, and this is achieved through socialisation. In the family and school the growing person internalises the society's norms and values so thoroughly that conformity feels like the expression of one's own desires rather than external compulsion. Motivation and normative expectation come into alignment; people want to do what they are required to do. Socialisation thus builds equilibrium into the personality itself, making willing conformity the normal case.
Because socialisation is never perfect and strains inevitably arise, the system also needs social control — the array of mechanisms, from informal sanctions of approval and disapproval to formal legal penalties, that discourage deviance and channel behaviour back into approved patterns. Where deviance threatens integration, control mechanisms restore the disturbed balance, functioning rather like a thermostat that returns the system to its set point.
The standardisation of role expectations is further secured by the pattern variables, the paired choices — affectivity versus affective neutrality, ascription versus achievement, particularism versus universalism, diffuseness versus specificity, and collective versus self-orientation — through which every role is defined. Because actors in a given institutional context orient themselves through the same combination of these variables, their expectations of one another converge, reducing friction and reinforcing stable interaction.
Equilibrium, importantly, is dynamic rather than frozen. Parsons allowed that systems adjust to internal and external pressures, moving between states of "moving equilibrium" as they grow more differentiated. In his later evolutionary theory he argued that societies develop through processes of differentiation and reintegration, so that change itself could be described as a passage from one equilibrium to another.
The framework has attracted sustained criticism. It is charged with a conservative bias, presenting the existing order as functionally necessary and thereby legitimising the status quo. Its emphasis on consensus and integration leaves it poorly equipped to explain conflict, coercion and the interests of dominant groups, as Dahrendorf and other conflict theorists argued. Robert Merton, working within functionalism, objected that Parsons over-stated integration and treated every institution as functional, ignoring dysfunctions and the possibility that parts of a system may work against one another. Critics also find the reasoning tautological, since a practice is explained by the need it is then said to fulfil, and the account of change unconvincing, grafted awkwardly onto a model built for stability. Despite these limitations, Parsons's analysis remains the most systematic statement of how shared values, socialisation and control combine to hold a society in ordered balance.
Examiner's perspective
This is a "how" question, so examiners look for the mechanisms of equilibrium set out clearly — AGIL, value consensus, socialisation, social control and the pattern variables — not a vague essay on functionalism. Answers that merely define equilibrium and stop, or that recite AGIL without explaining how it maintains balance, cap themselves in the middle band.
The strongest scripts link the mechanisms into a single logic: shared values integrate action, socialisation internalises them, control corrects deviation, and the AGIL subsystems keep the system supplied and coordinated. Stressing that equilibrium is dynamic, and closing with sharp criticisms from Merton and the conflict theorists, demonstrates the balanced command that lifts the answer. Precise vocabulary — functional prerequisites, latency, moving equilibrium — signals genuine mastery of Parsons.