This first volume in a series of clinical assessment handbooks, is intended to guide clinicians and researchers in choosing practical tools relevant for clinical assessment, intervention, and/or research in this area. This volume provides critical overviews of key assessment issues and available assessment tools in depression. It provides summary tables comparing and contrasting different instruments in terms of their time requirements, suitability, costs, administration, reliability, and validity. This compendia of information should serve as a valuable resource to practicing clinicians and to researchers who wish to develop state-of-the-science assessment strategies for clinical problems and to make informed choices about which devices best suit their purposes. The volume contains over 90 reviews of measures of depression and depression-related constructs.