A Swiss psychologist who proposed a theory for cognitive development which involved the sensorimotor, pre-operational, concrete operational, and formal operational stages
Proposed building middle range theories from a limited number of assumptions from which hypotheses are derived. -also distinguished between intended and unintended consequences of existing elements of social structure which are either functional or dysfunctional.
A French sociologist laid the foundation of what has become one of the leading approaches to American sociology today by demanding separate existence for the science of sociology on the grounds that it has both an object and a substratum exclusively its own
Departed from Freud's emphasis on childhood and instinct. This person delineated eight stages of psychosocial development