The abstract follows.
Three hypotheses concerning self-concept were tested using a sample of 1,050 seventh grade students and a selected subsample of 110 over- and under-achieving students. A significant positive relationship was found between self-concept of ability and grade point average; this relationship persisted even when measured intelligence was controlled. Specific self-concepts of ability related to specific areas of academic achievement were found; in some areas these were better predictors of achievement in the subject than general self-concept of ability. Self-concept was significantly and positively related to the perceived evaluation of significant others. A direction for further research is indicated.