The term motivation is derived from the Latin word movere, meaning "to move." Motivation can be broadly defined as the forces acting on or within a person that cause the arousal, direction, and persistence of goal-directed, voluntary effort. Motivation theory is thus concerned with the processes that explain why and how human behavior is activated.

The broad rubric of motivation and motivation theory is one of the most frequently studied and written-about topics in the organizational sciences, and is considered one of the most important areas of study in the field of organizational behavior. Despite the magnitude of the effort that has been devoted to the study of motivation, there is no single theory of motivation that is universally accepted. The lack of a unified theory of motivation reflects both the complexity of the construct and the diverse backgrounds and aims of...