Thoroughly revised and updated, the 4th Edition of this groundbreaking text traces the historical development of the foundations of modern occupational therapy theory; examines its status today; and, looks to its future. Dr. Kielhofner compares and contrasts eight well-known models, using diagrams to illustrate their practical applications and to highlight their similarities and differences. Well organized chapters are supported by extensive references. This title offers the most comprehensive coverage of theories in the field. It presents a framework for understanding what kind of knowledge is needed to support practice and critically examines existing knowledge. It provides a structure for thinking about and analyzing knowledge in order to compare different approaches. It includes summary tables for each model. It highlights profession-wide concepts such as dynamic systems, narrative, and occupational form.