The Yale Children's Inventory rating scales for completion by parents were developed to improve the ability of clinicians and researchers to evaluate the school-related problems of children. The inventory consists of 11 narrow-band and two broad-band scales, the Behavioral and the Cognitive. The concurrent and predictive validity of the Yale Children's Inventory scales are reported in a school-based sample of 103 boys. External criterion variables were obtained from parents, teachers, and standardized tests administered to the children. We found that the Attention scale overlaps both broad-band domains, indicating the importance and the intrinsic relationship of attention to both behavioral and cognitive functions, which supports the Diagnostic and Statistical Manual of Mental Disorders, ed 3 nosology for disorders of attention and activity regulation. It also increases the number of children whose assessment may be enhanced by the availability of systematic parent report forms.