A single case example runs throughout the book to compare different treatment approaches and provide a realistic introduction to the complexities of co-occurring substance use (e.g., opiate), process addiction (e.g., sex addiction), and psychiatric (e.g., major depression) disorders. Additional case examples appear in every chapter to highlight issues of diversity and social justice. DSM-5 diagnostic criteria, the 2014 ACA code of ethics, and 2016 CACREP standards are integrated throughout. A section on ethical considerations appears in every chapter, providing ethical dilemmas for readers to consider. Chapter-ending sections apply the text to adolescents and, unlike other books in the market, older adults. A chapter focused on neuropsychological and psychopharmacological issues addresses how these issues may influence client performance in treatment. A review of the state of the profession provides context for the field’s myriad licenses and certifications and educational levels of clinicians.