This important text shows how child development theory applies to professionals' working practice. Considering theories of development throughout the lifespan from the early years through to adolescence, and transitions to adulthood, this resource is essential reading for a range of professionals including social workers, teachers, and health and mental health professionals. The authors build up an integrated picture of the developing world of the child, looking at genetic and biological influences alongside individual psychological, interpersonal, familial, educational and wider community domains. The final part of the book looks specifically at issues for practice, including chapters on communicating with children exercising professional judgement, and planning, interventions and outcomes in children's services.