The purpose of this study was to construct a measuring scale of the self-concept, and to investigate developmental tendencies of self-concepts in adolescents. Based upon the results of factor analyses of ratings of self-descriptive-items by 317 adolescent students, a measuring scale consisting of six subscales (i.e., antisocialness, activeness, neatness-cleanliness, cheerfulness-friendliness, emotionality, and sincerity) was constructed, and was applied to 1055 junior high, senior high and college students. Some of the results obtained were: (a) regardless of age and sex self-concept of the adolescent was cheerful-friendly, sincere, and not antisocial, (b) in the male subjects, the degree of emotionality and sincerity showed increasing tendencies through junior high, senior high and college levels, while the female subjects showed an increase only in sincerity.
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