Section 3 addresses many important aspects of assessment, including family history, retrospective recall, and cultural, racial, and socioeconomic influences on assessment. It also incorporates a chapter on the evaluation of functional impairment. These are crucial elements for any researcher, but clinicians picking up this text will also find this section extremely useful and well written. The final section discusses both the uses and potential pitfalls of sleep, neuroendocrine, and neurochemical measures. These chapters are rather technical and probably will be of more use to biological researchers than to clinicians.