Mothers and fathers were asked to rate their child’s school performance in 4 areas (reading, math, social studies, and science). These four areas were used because they are common to curricula in every country. The questions were adapted from the performance in academic subjects section of the Child Behavior Checklist (CBCL) which has demonstrated criterion validity. Parents rated whether children were 1 = failing, 2 = below average, 3 = average, or 4 = above average in each area. A single scale was computed as the average of the 4 items.
Achenbach, T. M. (1991). Integrative guide for the 1991 CBCL 14-18, YSR, and TRF Profiles. Burlington, VT: University of Vermont, Department of Psychiatry