Parsons argues the central question sociology tries to answer is how is social order possible? Parsons argues social order is achieved through the existence of a shared value system. A culture is a set of norms, values, beliefs and goals shared by members of society. It provides a framework enabling individuals to cooperate by laying down rules about how to behave and what others expect of them, defining goals they should pursue and so on. Social order is only possible so long as members of society agree on these norms and values. This agreement is called value consensus. Value consensus is the glue that holds society together.
Thus the basic function of value consensus is to make social order possible. It does this by integrating individuals into the social system thus directing them too meet the systems needs. Parsons argues the system has two mechanisms to ensure individuals conform to shared norms and meet the systems needs. One of the mechanisms is socialisation; the social system can ensure its needs are met by teaching individuals to want to do what