The practice of psychology has been formally tied to psychological science in clinical psychology for over 50 years since the Boulder Conference (Raimy, 1950) and for counseling psychology for over 40 years since the Greyston Conference (Thompson & Super, 1964), which delineated the scientistpractitioner model as core to training. How science should inuence practice, however, has not achieved consensus. Recently, a movement toward articulating principles of evidence-based practice has gained visibility in psychology with the Report of the 2005 Presidential Task Force on Evidence-Based Practice (American Psychological Association, 2005), which provided the denition, “Evidence-Based practice in psychology (EBPP) is the integration of the best available research with clinical expertise in the context of patient characteristics, culture, and preferences” (p. 5).