In the most general sense, organizational psychology is the scientific study of individual and group behavior in formal organizational settings. Katz and Kahn, in their classic work, The Social Psychology of Organizations (1978), stated that the essence of an organization is patterned human behavior. When behavior is patterned, some structure is imposed on individuals. This structure typically comes in the form of roles (normative standards governing behavior) as well as a guiding set of values. An organization cannot exist when people just do their own thing without any awareness of the behavior of others.

p. 2 - Organizational Psychology, 2002