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Abstract: The book is comprised of a assemblage of essays, readings and assorted works by broad array of authors, each making a contribution to achieving the book's central goal of helping the reader in the application of valid and appropriate knowledge in human affairs for the purpose of creating intelligent action necessary to bring about planned change. Planned change is described as a conscious, deliberate, and collaborative effort to improve the operation of a human system. Greatest emphasis is placed on the processes of planned change, on how change is created, implemented, evaluated, maintained, and resisted. Other topics discussed include the social and psychological consequences of planned change, antecedent conditions for change, strategies for effecting change, plus the role of training, consulting, and applied research in creating and maintaining change. The book is organized into four sections, with Part I devoted a retrospective look at the history of planned change and outlines the development of the theory and practice in the field. Part II deals with the concept of systems analysis as a tool for observing and diagnosing the current state of human systems. The actual planning and intervention processes involved in enacting change are discussed in Part III. Finally, Part IV addresses the concept of values and goals as key factors in determining the success of a change effort.