The purposes of this dissertation were to determine (1) if self-concept is affected by the independent conditions of skin color and sex and (2) if self-concept is affected by the interactions resulting from the variables of skin color and sex. Two hypotheses were tested: (1) that there would be no significant main effects between the variables of sex and students' perceptions of skin color on the self-concept of Mexican Americans from a low socioeconomic level and (2) that there would be no significant interaction effects between sex and skin color on the self-concept. This study was conducted in 2 New Mexico public high schools during 1971-72 and consisted of 174 Mexican American 10th, 11th, and 12th grade students for whom 4 data indices were available (scores on the Tennessee Self Concept Scale, scores on Hollingshead's Two-Factor Index of Social Position, classification as to skin color, and sex). Interviews with the subjects by the investigator provided information pertaining to self-perception of skin color in addition to the investigator's rating. Color transparencies were made of the hand and arm of each subject for evaluation by 1 Anglo and 2 Mexican American judges. Analysis of variance was done to determine any significant main effects and interactions followed by an After F Test. Where significant F ratios were obtained, the Neuman Keul's Multiple Comparison Test was applied to determine significant differences. Pearson's Coefficient of Concordance was used to determine significant correlations between the students', judges', and investigator's ratings of skin color. Findings partially supported hypothesis 1 and found no significant interaction effects in support of hypothesis 2. (NQ)