The relationship between Holland's SDS differentiation scale and psychological adjustment

Abstract

The study examined the relationship between Holland's SDS differentiation scales and indices of psychological adjustment on the MMPI. The independent variables were: degree of differentiation as calculated with an Iachan Index, and level of differentiation derived from averaging the six SDS summary profile scores. Two indices of the dependent variable, psychological adjustment, were used: the ego-strength score and the average elevation of eight clinical scales on the MMPI. Fifty-one subjects were recruited. Two multiple regression. analyses revealed a nonsignificant R2 of 0.01. The results indicated that the SDS career interest differentiation scales were not related to the MMPI indices, and do not appear useful in predicting degree of psychological adjustment. This finding challenges Holland's theoretical contention that individuals who are undifferentiated may be in need of personal counseling. A second finding was the successful use of the SDS with residential psychiatric patients.

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