There are many reviews of depression scales to which the reader can turn for descriptions of methods we did not review (1–6). Several scales that are not reviewed here are closely related to those that are included. The Wakefield Depression Inventory (7), for example, is a variant of Zung’s scale and Max Hamilton was involved in its development; the Cronholm-Ottosson Depression Rating Scale (8) was developed by a team that also involved Marie Åsberg. Other measures are more broad-ranging; the scales included in this chapter measure depression alone. For example, we did not review more general assessments that include a depression component, such as the Middlesex Hospital Questionnaire (9), Åsberg et al.’s Comprehensive Psychopathological Rating Scale (10), or the Schedule for Affective Disorders and Schizophrenia (SADS) (11). The Hopkins Symptom Checklist (HSCL) contains an 11-item depression subscale (12). The omission of combined instruments does not imply any limitations in them; on the contrary, they prove ideal for many applications and readers who wish to measure general psychopathology may find them useful.