A comprehensive understanding of the different theoretical models in mental health is essential when working with people with mental health difficulties. Brought together by a multidisciplinary team, this book presents a critical overview of the key theoretical perspectives that underpin mental health practice, examining both traditional and contemporary schools of thought. Offering an accessible foundation for expanding your knowledge, the authors argue that no single theory provides a complete framework for practice on its own, highlighting how each theory has contributions, strengths and limitations. New to this edition: Two brand new chapters exploring intersectional and environmental perspectives Expanded coverage of LGBTQIA+ and trauma-informed models, featuring two new authors with expertise in trauma-informed, recovery-focused approaches and evidence reviewing Greater focus on service-user led knowledge and experience Supported by a range of exercises and case studies, this book remains an essential resource for anyone studying or practising in the field of mental health.