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 Camberwell Assessment of Need, a widely used needs assessment for people with severe mental health problems. Needs are assessed in twenty-five areas of life and cover a broad range of 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 includes the rating scales, descriptions of how they were developed and their psychometric properties, administration details, a full training programme, guidance on scoring and blank assessment forms (for all three versions mentioned above) for photocopying. CANFOR has been rigorously developed by a multi-disciplinary team at the Institute of Psychiatry and is suitable for use in all forensic mental health and prison settings.