The study tests hypotheses derived from the proposition that open education promotes self-concept. The Sear's Self-Concept Inventory, yielding scores in six self-concept "areas," was administered to 316 students, ages 9 to 12, from six suburban schools. The Walberg-Thomas Scales rated each school as to degree of openness. No significant difference in any of the six "areas" of self-concept was found between students in the open and those in the traditional groups. Significant differences in total self-concept were found between males in open and traditional schools, between males and females in open schools, and between open schools. No correlations were found between a school's openness and the students' self-concept. (Author)