Organization development (OD) originated in the 1950s-1960s as an integrated approach to planned organizational change using behavioral science. OD aims to improve organizational effectiveness through a planned, systematic process utilizing behavioral science theories. It is defined as a planned change process to improve organizational culture through behavioral science methods like action research. The overall goal of OD is to improve organizational performance by enhancing processes like communication, decision-making, leadership, and developing trust and cooperation among employees.