This groundbreaking core textbook offers a comprehensive overview of different approaches to the causes, assessment and treatment of psychological disorders. The book includes important diagnostic frameworks, including the new DSM-5-TR, ICD-11 and PDM, but also widens the scope of coverage beyond mainstream psychiatric models to include psychological, biological, historical, sociocultural and therapeutic approaches. Contemporary and well-balanced, this book provides an even-handed and holistic foundation, allowing students to develop a strong critical mindset while retaining a robust research-driven orientation. This new edition: - features an innovative structure organized by presenting problem, examining each in a broad context of traditional psychiatric and alternative approaches - is grounded in lived experience of disorder: shining a spot-light on service-users through 'Case Examples' scenarios and 'Lived Experience' perspective pieces - Supports student learning and critical thinking through engaging 'Controversial Question' and 'In Depth' features - Features an attractive new layout and plenty of colour illustrations - Is supported by impressive online support features including lecture slides, a test bank, instructor manual, video library, student study questions, self-test quizzes, flashcard activities and more. Now thoroughly updated to include the latest developments in research and clinical practice, along with enhanced in-text and online pedagogy to support instructors and learners, this book is ideal for undergraduate and graduate students on abnormal psychology, psychopathology, mental health or clinical psychology courses.