The Camberwell Assessment of Need Forensic Version (CANFOR) is a tool for assessing the needs of people with mental health problems who are in contact with forensic services. It is based on the CAN, a widely used needs assessment for people with severe mental health problems. Individual needs are assessed in 25 areas of life, spanning health, social, clinical and functional domains. Comprehensive versions are available for research (CANFOR-R) and clinical use (CANFOR-C), as well as a short summary version (CANFOR-S) suitable for both research and clinical use. CANFOR was rigorously developed by a multidisciplinary team at the Institute of Psychiatry, London, and is suitable for use in all forensic mental health and prison settings. This second edition provides an update of the CANFOR tools and their application in clinical and research settings. The assessment forms are freely available to download from the CAN website (researchintorecovery.com/can) and cambridge.org.