Subjects were 513 fifth grade boys in a city in Osaka Prefecture. Subjects were divided into problem and nonproblem groups based on their responses to a questionnaire about their attitudes toward school, teachers, parents, leisure, etc., and on teachers' evaluations. The problem group (70 boys) and the nonproblem group (42 boys) were compared on their responses to the questionnaire. A total of 23 items were found to be significant between the 2 groups. By means of factor analysis, 4 dimensions were found to lead to delinquency out of the 23 items. These were school adjustment-maladjustment, emotional conflict in the parent-child relationship, leniency-severity by the father, and dangerous playing. The classification of typical problem children resulted in 17 children being classified according to 5 degrees of potential delinquency. Figures, tables, and references are included. (Author abstract modified)