The fourth edition of this popular student-friendly textbook provides a thorough and detailed exploration of the key theoretical approaches that inform occupational therapy in the 21st century. It provides a comprehensive overview of how occupation can be used therapeutically, and of both the determinants and consequences of occupation. The book uses the familiar filing cabinet metaphor to offer an easily digestible classification system for theoretical ideas in occupation therapy. It also includes historical perspectives on how these key theories evolved, as well as enlightening commentary of the latest theoretical developments. Links to practice are highlighted throughout with extensive examples and case studies. Fully updated with key occupation-focused models, the fourth edition also features a new chapter on the most influential theorists in the field. Including illustrative figures and student activities to help develop a fuller understanding, this is an essential textbook for anyone studying occupational therapy or occupational science.