This book provides a comprehensive introduction to the theory and practice of assessment and intervention planning with young people who offend. It will help equip practitioners with the knowledge and professional skills central to these critically important tasks. The context for practice is changing rapidly and the authors take into account current policy developments along with a wide range of literature on assessment practice in criminal justice and social care. The book encourages readers to think critically and to take practical steps to enhance their own practice. It will be important reading for anyone working with young people who offend.