ESTIMATING FULL-SCALE IQ WHILE MINIMIZING THE EFFECTS OF PRACTICE

The present study attempted to ascertain the best estimate of true Wec hsler Adult Intelligence Scale-Revised (WAIS-R) Full Scale IQ (FSIQ) w hen confronted with an individual who recently had been administered t he WAIS-R. Sixty-five college undergraduate participants were administ ered the WAIS-R twice within 14 days. WAIS-R summary scores, factor sc ores, and short-form estimates obtained from the second assessment wer e compared to FSIQ at the first evaluation. The results indicated that Verbal Ia the Verbal Comprehension factor score, and subtracting 6 po ints from the current FSIQ are the least affected by repeat assessment and the most accurate estimates of FSIQ at the first evaluation. Use of these estimates of FSIQ are encouraged when evaluating an individua l who has been administered the WAIS-R in the recent past.