Based upon recent reviews of evaluation methodology in Organization Development (OD), a description of a viable method for measuring planned organizational change is synthesized. The paper reports on the application of the procedure to a university student counseling center involved in an OD project utilizing an eclectic intervention. A diagnostic, reliability-tested questionnaire was used in a three year modified multiple time series research design, with a closely matched comparison organization, and data were analyzed for three types of change. Results support the contention that the measurement method is viable for accurately assessing the impact of an OD intervention and thus providing the groundwork for developing a rigorous, empirical1 y-based theory of OD. However, several problems and tradeoffs are made explicit. SINCE its inception in the early 1960's, Organization Development (OD) has been a fast-growing field. The number of practitioners and scholars in the field has grown steadily as OD has been employed in a variety of organizational settings. Likewise, the literature on OD has grown rapidly, but there are very few studies of its effects that can stand the rigorous testing expected of behavioral science research (Margulies, Wright, and Scholl, 1977). The need for better OD evaluation in systematic research efforts continues to be emphasized (Kimberly and Neilsen, 1975;Lippitt, 1969; and White and Mitchell, 1976). As Armenakis, Field, and Holley (1976) point out, the field orientation of OD dictates that methodological proceduresThe author wishes to thank the following people who have served as internal consults to the OD project: Rosemary