We review research on and the practice of Organization Development. Organization development has been an active area for research during the past decade, and current research benefits from well‐developed theoretical frameworks of organization change. Organization Development has also been a fertile ground for the development of change practice methodologies during this time. To organize this chapter, we distinguish between change process and implementation theories. Change process theories, which typically guide research on change, are sorted using Van de Ven and Poole's (1995) typology of teleologic, life‐cycle, dialectic, and evolutionary motors for change. Likewise, we categorize implementation theories, which typically guide the practice of change, by their underlying motors of participation, self‐reflection, action research, and narrative/rhetorical intervention. We identify some contemporary organization development interventions in terms of their implementation motors and indicate ways implementation and change process motors may complement each other. Despite their common interest in change, and complementary theoretical motors, we find that change process research and implementation research occupy relatively separate intellectual spheres. This divide is hindering further theory development regarding change. We outline some possible causes of the divide and propose strategies to bridge it.