Book excerpt: Intellectual Disability Psychiatry is a comprehensive and accessible guide to the management of mental health problems in people with intellectual disabilities. A clear and user-friendly handbook, it will help busy healthcare professionals develop their understanding of the mental health problems of service users with intellectual disabilities. Most importantly, it will help them make an accurate diagnostic assessment and develop and implement an holistic, person-centred, evidence-based management plan. Topics covered include the classification of mental disorders in intellectual disability, the clinical assessment of specific disorders, psychological, psychopharmacological and social interventions, and the practical, legal, and social aspects of supporting service users with intellectual disability who have mental health problems.