Thirty-two clients completed three standard personality inventories at the time of acceptance for rehabilitation services and again six years later. Stability coefficients for the 16 primary scales and eight secondary factors of the 16PF-E were calculated. The coefficients for six primaries and four secondaries exceeded .50 and were significant at the .001 level (A, E, F, H, I, L, Exvia, Cortertia, Independence, and Prodigal Subjectivity) with four being exceptionally high: I. Sensitive (.80), Exvia (.67), Cortertia (.75), and Prodigal Subjectivity (.70). These results, in conjuction with other data and previous research, provide additional support for Cattell's conceptualization of the normal personality sphere.