The problem of the social organism, inherited from Comte and Spencer, is the rock upon which the modern schools of sociology have split. Society is composed of parts that have the power of independent locomotion. The fundamental problem of sociology is how to conceive the relations between the parts in such a way as to explain the fact that societies do behave as units. This is the problem of social control. Just as psychology is an account of the manner in which the individual organism exercises control over its parts or rather of the manner in which these parts co-operate to carry a corporate existence, so sociology is a point of view and method for investigating the processes by which individuals are inducted into and induced to co-operate in some sort of corporate existence which we call society. Sociology is the science of collective behavior.