The document discusses definitions of organization development (OD) provided by Burke, French, Beckhard, and Beer. It defines OD as a planned, system-wide process using behavioral science to improve an organization's effectiveness and ability to cope with change. The document outlines key aspects of OD, including its historical development from 1950-2000 through approaches like laboratory training, action research, participative management, quality of work life, and strategic change. It concludes by restating that OD is the planned application of behavioral science to improve an organization's strategies, structures, and processes.