introduces students to the underlying concepts and principles, as well as the practical application, of functional behavior assessment. Students learn how to identify target behaviors, select measurement and data collection methods, formulate function-based intervention plans, and monitor and maintain progress for behavior-change programs. The text begins by defining functional behavior assessment and discussing its place within the larger field of study of behavior analysis, as well as the ethical assessment of behavior. Subsequent chapters address the evaluation of the social significance of particular behaviors, the process of conducting assessment, data collection, systematic manipulation in structural and functional analyses, and more. Each chapter features learning objectives, key terms, and Test Your Understanding exercises to ensure students grasp critical material. Case studies and learning activities interspersed throughout the text furnish students ample opportunities to apply concepts and theory to clinical case studies and enhance their critical thinking skills. The revised first edition is updated to reflect new ethics requirements. With an emphasis in practical application, is ideal for undergraduate and graduate courses in behavior analysis focusing on functional behavior assessment.