In Human Behavior Theory and Applications, authors Elizabeth DePoy and Stephen Gilson use a critical thinking approach to engage students to think in depth about theory and its use in social work practice. With a strong focus on diversity, this book expands its theory coverage to include progressive and the most cutting-edge contemporary thinking. The authors skillfully introduce theory, critically examine each theory, including developmental theories, environmental theories, diversity theories, systems theories, and new and emerging theories, and then apply each theory to social work practice providing a synthesis of classical and contemporary theory for scholarly analysis and application to professional, intellectual, and social action.