To examine the psychometric adequacy of two existing instruments, the Functional Status Questionnaire (FS IIR) and the Parent Behavior Checklist (PBC), in two ethnic minority groups. Age-specific items that were not relevant for children ages 1 to 5 were removed from the FS IIR and PBC. Measures were administered to 196 Latino and African American parents of children aged 1 to 5. Reliability, variability, item-convergence, and factor structure were examined. The results highlight common pitfalls in using existing measures in populations other than those on which they were originally developed. Both measures were modified resulting in all scales having low or acceptable reliability. Construct validity was supported for both the FS IIR and the PBC through confirmation of hypothesized relationships. In both ethnic groups, factor analyses supported the hypothesized factor solutions for the FS IIR and the PBC. Use of measures in minority groups requires researchers to be cognizant of the issues of psychometric adequacy in all groups. The psychometric properties of the FS IIR and the PBC were generally acceptable for Hispanics and African Americans, but each had some problems in at least one psychometric characteristic in one or both groups. Different factor loadings for some items for Hispanics and African Americans suggest different interpretation of items between the two cultural groups.