The stability of the Adaptive Behavior Inventory for children (ABIC) over a 4-year period was investigated. The sample was composed of 44 children, distributed approximately equally within racial and ethnic groups (Anglo-American, Black, Mexican-American), socioeconomic group (middle and lower), and gender. Three types of stability were considered: stability of individual scores, stability of group means, and test-retest correlations. Individual scores demonstrated considerable changes. No set of scores for any ABIC scale fell within one standard error of measurement in 68 percent of the cases. Mean scores also showed considerable differences and typically were lower on the second administration. Pearson Product Moment and rank order correlations were generally significant (in the mid-50s to low 60s). (Author/MP)