With autism spectrum disorders (ASD) on the rise, there is an urgent need for health practitioners to learn about the nature, course, assessment, and diagnosis of the various ASDs. This book addresses the main domains of assessment, defines the purpose of the assessment, suggests test instruments, and includes user-friendly features such as Don't Forget, Rapid Reference boxes and Test Yourself questions at the end of each chapter. Mental health practitioners will be equipped with all the information they need to utilize the varied assessments frequently employed in an autism evaluation.