Children and adolescents with emotional and behavioural problems who are referred to mental health services for assessment often have undiagnosed mild learning disabilities, and this guide is written for clinicians involved in making such assessments. It provides full guidance on common developmental disorders and their assessment, focusing on mild to moderate disabilities in the school-aged child. It covers intellectual disabilities, dyslexia, dyscalculia (mathematical disability), autism spectrum disorders, speech and language impairment, developmental coordination disorder, and emotional and personality development. Each chapter includes an account of normal development, including developmental milestones, an overview of the disorder, and its clinical assessment. This important professional guide will be invaluable for all child health and mental health professionals and trainees, including paediatricians, psychiatrists, mental health workers, clinical psychologists and educational psychologists.