Abstract Evidence-based assessment (EBA) emphasizes the use of research and theory to inform the selection of assessment targets, the methods and measures used in the assessment, and the assessment process itself. Our review focuses on efforts to develop and promote EBA within clinical psychology. We begin by highlighting some weaknesses in current assessment practices and then present recent efforts to develop EBA guidelines for commonly encountered clinical conditions. Next, we address the need to attend to several critical factors in developing (...) such guidelines, including defining psychometric adequacy, ensuring appropriate attention is paid to the influence of co-morbidity and diversity, and disseminating accurate and up-to-date information on EBAs. Examples are provided of how data on incremental validity and clinical utility can inform EBA. Given the central role that assessment should play in evidence-based practice, there is a pressing need for clinically relevant research that can inform EBAs. (shrink)