The Handbook of Infant, Toddler, and Preschool Mental Health Assessment brings together for the first time, leading clinical researchers to provide empirically based recommendations for assessment of social-emotional and behaviour problems and disorders in the earliest years. Each author presents state-of-the-art information on scientifically valid, developmentally based clinical assessments and makes recommendations based on the integration of developmental theory, empirical findings, and clinical experience. Though the field of mental health assessment in infants and young children lags behind work with older children and adults, recent scientific advances, including new measures and diagnostic approaches, have led to dramatic growth in the field. The editors of this exciting new work have assembled an extraordinary collection of chapters that thoroughly discuss the conceptualizations of dysfunction in infants and young children, current and new diagnostic criteria, and such specific disorders as sensory modulation dysfunction, sleep disorders, eating and feeding disorders, autistic spectrum disorders, anxiety disorders, posttraumatic stress disorder, and ADHD. Chapters further highlight the importance of incorporating contextual factors such as parent-child relationship functioning and cultural background into the assessment process to increase the validity of findings. Given the comprehensiveness of this groundbreaking volume in reviewing conceptual, methodological, and research advances on early identification, diagnosis and clinical assessment of disorders in this young age group, it will be an ideal resource for teachers, researchers, and a wide variety of clinicians including child psychologists, child psychiatrists, early intervention providers, early special educators, social workers, family physicians and paediatricians.