Comparison of WISC and WISC-R Scores of Highly Gifted Students in Public School
26 highly gifted students, aged 10 to 12 yr., were administered the WISC to compare their scores with previously obtained WISC-R scores. The interval between the administration of the two instruments ranged from 9 to 12 mo. Correlation coefficients for the Verbal, Performance, and Full Scale IQs were .44, .52, and .42, respectively. A significant difference in the mean Verbal and Full Scale IQs was found; the WISC-R showed higher means, while the mean difference between the Performance IQs was not significant. Significant differences were found on three verbal subtests, Information, Similarities, and Comprehension, and on one performance subtest, Coding. The results indicated that these highly gifted students performed consistently better on the recently revised WISC-R which they had been given previously than on its predecessor, the WISC.