Parents are often asked to complete behavioral checklists and personality inventories regarding their children when they bring them in for psychotherapy or neuropsychological testing. The Child Behavior Checklist (CBCL), the Conners' Parent Report Scale (CPRS), and the Personality Inventory for Children (PIC) are frequently used tests. Some research has raised doubts about the extent to which the content of these measures is redundant. Knowing the degree to which they do overlap might allow clinicians to administer only one or two of the tests. If the tests measure similar constructs, consistent parental support for them would strengthen the diagnostic hypotheses. Analysis was performed on the CBCL, the CPRS, and the PIC for parents (N=46) of children with ADHD. Clinical implications are discussed. The study uncovered common factors within the PIC, CBCL, and CPRS, however, while integrating the three instruments, they were not as consistent as expected. A greater understanding of the true meaning of these behavior rating scales would be beneficial to clinicians. (JDM)