This text examines late-1990s evidence of which methods are the most successful forms of intervention when working with children and their families. It covers a wide range of approaches and services, with particular emphasis on methods designed to help children with identified problems. After discussing the principles, designs and debates associated with ideas of effectiveness and evidence, the text evaluates 1990s practice in child and family work, including: early years provision, family mediation, child and adolescent psychiatry, treatment for children who have been sexually abused, and work with foster children and their families.