The purpose of this study was to evaluate the measurement model and theory underlying the Educational Participation Scale-Modified (EPS-M) using confirmatory factor analysis. A probability sample of 225 licensed social workers in Maryland completed the mailed survey. The findings support a six independent factor model. Results also support the EPS-M as a valid and reliable measure for identifying motivational orientations of social workers who pursue continuing professional education. Professional knowledge was the most frequently reported motivational orientation. Implications regarding social workers' motivational orientations and the design of continuing professional education activities are discussed. (Contains 6 tables and 6 figures.)