Individuals, groups, industrial and social organizations, and communities voluntarily turn to an expert or a professional to help them change or improve their functioning. The process of change and the techniques employed in facilitating it have comparable elements that are studied and reported in this volume. Research into these comparable elements reveals a surprising number of common factors that fit into a general framework for the development of concepts of helping to bring about change. These concepts, in turn, are found useful in the training of professionals.