Two types of classification error are possible in competency tests: erroneous classification of an individual as a "master" of the subject (Type II error), and erroneous classification of a master as a "nonmaster" of the subject (Type I). If steps are taken to minimize Type II errors, an artificially high number of true masters…

The constancy of intelligence quotients (IQs) of 161 gifted Israeli children, obtained initially in grades K-4 and retested 1-4 years later, was examined. Results indicated that 86% still qualified as gifted on the retest, with mean differences of five to eight IQ points. Performance scores tended to remain constant, whereas verbal scores tended…