Mothers, teachers, and assistant teachers completed the Richman Behavior Checklist (BCL) at ages 2 and 3 years and the Achenbach Child Behavior Checklist for Ages 2–3 (CBCL 2–3) at 3 years for a large sample of low birth weight, premature children. Interinstrument correlations for total scores were moderate, higher for teachers and assistant teachers than for mothers, with moderate temporal stability for BCL scores. Interrater agreement for either total scores or classifications of clinically significant scores was moderately high between teachers and assistant teachers only, and children identified as disturbed by mothers versus teachers represent almost nonoverlapping groups. Furthermore, many more children were identified as disturbed using the BCL. The most powerful predictors of mothers' total CBCL 2–3 scores were HOME Inventory scores and self-reported depression. The use of these scales in clinical and research contexts is discussed.