This study developed a semantic differential (SD) instrument to measure self-concept that was not influenced by social desirability. An alpha factor analysis of 53 SD scales produced five interpretable factors for the females and five interpretable factors for the males. A subsequent investigation of the convergent validity of each of the factors resulted in the confirmation of only the Evaluation and Potency factors for males and the Evaluation, Activity, and "Intellectual Ability" factors for females as valid measures of self-concept. The Evaluation dimension for females and the Potency dimension for males could be influenced by the social desirability factor; however, the extent of this influence upon the dimensions was not of sufficient magnitude to render them invalid measures of self-concept. (Author)