Contrary to current anti-testing sentiment, Sangamon State University's recently designed M.A. program in clinical psychology requires training in the use of psychodiagnostic instruments and presents assessment as an integral part of therapy or counseling. This paper offers empirical and conceptual support for this position. Data is summarized from a survey of mental health agencies in Illinois which indicates that these agencies desire MA psychologists who have assessment skills. In addition, a conceptual framework is described which outlines the process of effective prescriptive intervention and the implications of this framework for the role of assessment in counseling or therapy are specified. (Author)