Social psychology, personality theory, economics, and epistemology have suffered from a failure to incorporate dynamic behavior into theory. Dynamic behavior is the rate of change of behavior and the forces that cause change. Not much is known about dynamics, but fifty years ago Lewin linked interdependence to dynamics; his ideas were articulated in this study as a tension force anchored between a fixed personality and the environment and expressed as a seeking of preferred social situations. Couched in ideas of the whole where a group is the sum of its tension system, outcomes like stability or trust for dyads, or like innovation and failure for organizations, can be predicted.