Dimensions of Human Behavior: Person and Environment, Fourth Edition, is the revision of a highly successful text for a core course area in the social work curriculum. Students are required to two take two theory courses that orient them to the social work perspective. This volume and its companion, provide the most comprehensive coverage available for the social work theory course. The book(s) are unique in that they provide faculty with an organizing framework which is currently not available in other texts. Our books break down the core content along three primary dimensions: Person, Environment and Time. This book covers the biological dimension (person) and the social factors (environment) that impact human development and behavior. Changes to this edition include the following: 1) Introduction to a new critical thinking/ethical decision-making feature to help students think critically how content can be applied to practice situations. 2) New and updated case material 3) New topical coverage such as greater emphasis on diversity, EBP, positive psychology, mindfulness, international and political changes in the social environment, postmodern theories, and information technology. 4) Updated photos that complement key ideas in the text. 5) Revised and enhanced student and instructor ancillary materials. 6) Stylistic design changes for a thinner, sleeker book.