Fundamentals of Psychological Assessment and Testing describes how to effectively practice psychological assessment, diagnosis, case conceptualization, and treatment planning in the outpatient mental health field. Written principally for those in training and clinical practice, this book adopts an applied practical approach, outlining the process in a clear, step-by-step manner, with numerous illustrations, flowcharts, figures, and tables. It also includes report outlines and practice forms with pre-drafted treatment recommendations, available on an accompanying e-resource, for the major psychotherapy approaches and common alternative treatment modalities. Chapters describe how to employ these practice outlines and forms, with clearly defined concepts and psychological constructs. Finally, the book includes a chapter on the basics of psychological measurement so that mental health clinicians of all training backgrounds know when to utilize this valuable service and be sufficiently knowledgeable in how to read and interpret clients’ test scores. Nowhere else in one title will readers find such valuable information regarding the practice of psychological assessment, diagnosis, case formulation, and treatment planning. This book is essential for those in both mental health clinical training and practice.