This book represent s a personal statement of the authors' evolving experience as collaborators in the work of developing organizations. Focus is on three critical interfaces: the organization-environment, the group-group, and the individual organization. Close attention is paid to the attainment both of organizational goals and of individual purpose. A sequence of intervention in which diagnosis precedes action planning and the notion that organizations can usefully be conceived of as systems are emphasized. The book is arranged to present first the authors' overview of organization development and a summary of the research on which it is based, then to examine each of the three critical interfaces, presenting brief examples of work on each. (NL)