This document provides information about behavioral sciences and the biopsychosocial model of health care. It defines behavioral sciences as a branch of science that deals with human and animal behavior through systematic observation and experimentation. It notes key differences between behavioral sciences and social sciences in their level of analysis. The document also describes the biopsychosocial model, which views health as influenced by biological, psychological, and social factors rather than just biological ones. It discusses implications and challenges of this model in medicine.