This comprehensive volume shows how to use both diagnostic and behavioral assessment knowledgeably and effectively throughout the process of treatment. The two traditions have developed along separate paths each with its own conceptual underpinnings and psychometric strengths. Used together, they can produce a complete picture of a child's or adolescent's needs and strengths. The expert editors and contributors describe the full range of evidence-based assessment tools and illustrate their application with two intake-to-termination case examples. Reproducible tools include a behavioral recording form and a multipage case conceptualization worksheet that can be downloaded and printed in a convenient 8 1/2" x 11" size.