Systemic Diagnosis: An Application of Family Systems Theory helps marriage and family therapists incorporate theory-driven assessment and diagnosis into their practice, demonstrating how they can diagnose systems, not just individuals. This introductory textbook argues that theory and diagnosis are key to providing excellent care in family therapy. Rooted in family systems theory, Jacob B. Priest offers readers a model to diagnosis the history, structure, and boundaries of family systems. Chapters begin by looking at traditional and relational models of diagnosis before diving into systemic diagnosis. Readers are introduced to the EPIC assessment and guided on how to use it in their practice. Filled with case studies throughout, the book also includes digital content so students can practice a diagnosis process rooted in family systems theory. Designed to be used on COAMFTE accredited programs, this book is essential for couple and family therapy students who are taking courses in assessment and mental health diagnosis and treatment.