“Measurement is arguably the most foundational task in a science—and one of the most complex. These complexities are too often ignored in clinical science and practice and as a result misinformation is created and promulgated. This well written, comprehensive, and practical book is an important corrective. The authors are leading scholars in behavioral assessment and psychometrics and write in a clear and integrative manner that provides readers with thorough understanding of the complexities of measurement in clinical psychology.”William O'Donohue, Ph.D., Professor, University of Nevada, Reno“Scientific Foundations of Clinical Assessment is a tour-de-force! For many years no credible graduate program in clinical psychology would fail to include Wiggin’s seminal text, Personality and Prediction, in their clinical assessment course. The same should now be said with respect to this text by Stephen Haynes, Greg Smith, and John Hunsley. Clinical assessment is a very difficult enterprise, riddled with confusing and complex psychometric and statistical principles. This text by Haynes and colleagues is wonderfully rich and comprehensive, yet presented in a very user-friendly manner that the average clinician and student can readily follow and fully appreciate”Thomas A. Widiger, Department of Psychology, University of Kentucky, Editor: Annual Review of Clinical Psychology and Personality Disorders: Theory, Research, and Treatment