Throughout the history of mental health practice, conflicting and irreconcilable theories have caused confusion about how disorders form, what they look like, and how they should be assessed and treated. But thanks to dramatic scientific advances in recent years, these patchwork theories can now be replaced by a unified, science-based, biopsychosocial framework for behavioral healthcare. This book presents the essential scientific and ethical foundations of the biopsychosocial framework and then applies it across the treatment process, from intake through outcome assessment. In doing so, the book provides a critical basis for the increasingly integrated healthcare systems of the 21st century. Timothy P. Melchert, PhD , graduated in 1992 from the University of Wisconsin–Madison with a doctorate in counseling psychology.   He taught at Texas Tech University before moving to Marquette University in 1998. He served for many years at Marquette as training codirector, department chair, and assistant vice provost for graduate programs, and he also served on the State of Wisconsin Psychology Examining Board.   He is a member of multiple journal editorial boards. His previous book, Foundations of Professional Psychology: The End of Theoretical Orientations and the Emergence of the Biopsychosocial Approach , was published in 2011.