Social Validity is a concept used in behavioral intervention research. It focuses on whether the goals of treatment, the intervention techniques used, and the outcomes achieved are acceptable, relevant, and useful to the individual in treatment. The Social Validity Manual, Second Edition, provides background on the development of social validity, an overview of current research in social validity, and guidelines for expanding the practice of social validation. The book offers detailed information on scales and methods for measuring social validity across the goals, procedures, and effects of treatments utilized in various fields. The second edition incorporates advances in research findings and offers two new chapters on the use of social validity in the health sciences and how social validity plays an important role in increasing cultural awareness.