The history and background of the analysis of the basis of power is examined, beginning with its origins in the works of Kurt Lewin and his followers at the Research Center for Group Dynamics, particularly the early research by John R. P. French. The original French and Raven (1959) bases of power model posited six bases of power: reward, coercion, legitimate, expert, referent, and informational (or persuasion; Raven, 1965), Since then, as the result of considerable research, the model has gone through significant developments. A more comprehensive model is presented here that reviews the following: various motivations of the influencing agent; an assessment of available power bases in terms of potential effectiveness, time perspective, personal preferences, values and norms; consideration of other strategies such as manipulation; utilization of various preparatory and stage-setting devices to strengthen one's power resources; implementation of the power strategies; assessment of effectiveness of influence attempt and its positive and/or negative aftereffects; use of various ameliorative devices; and review, reconsideration, and another round of influence strategies. The overall model is examined in terms of its applicability to various settings including hospital infection control, patient compliance with physicians' recommendations, confrontations between political figures, children's influence on their peers, conflict resolution and negotiation, as well as supervisor/subordinate relationships.