The present study examined school adjustment problems of about 1000 students aged 6 through 17 years. The Behavior Problem Checklist was factor-analyzed to identify multivariate factors of adjustment problems. Age- and sex-based subgroups were then compared on these factors, and some estimates of criteria for abnormality were derived. Finally, the prevalence of each problem on the checklist was derived separately for age- and sex-based subgroups, which were then contrasted on the items. The results provide basic information about the adjustment problems of those students who are not considered socially or personally maladjusted.