Examined were the effects of chronological age and mental age on the understanding of logical rules by four subject groups (10- to 14-years-old): 10 average IQ Ss, 10 learning disabled Ss, 10 older educable retarded Ss and 10 younger educable retarded Ss. (Author/CL)

Scores on the Wechsler Adult Intelligence Scale (WAIS) were compared with reevaluation scores obtained four years later on the WAIS-Revised for a group of 108 mildly and moderately retarded adults. The moderately retarded subgroups (N=22) demonstrated significantly higher WAIS-R intelligence quotients. Implications for use of the WAIS-R are…