Summaiy: Three groups of subjects rated each item in Rotter's I-E Scale for its social desirability value. Social desirability scale values (SDSV) of paired items were compared with one another. Results indicated that paired items are not sufficiently similar in their SDSVs, thus enabling subjects to respond on the basis of social desirability. All three groups rated internal items as being significantly more socially desirable than external items. The correlations between the SDSV ratings of the three groups were highly significant. The results indicate that the scale, as it is currently used, is seriously deficient.