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Terman found that when the Binet-Simon scale was administered to U.S. children, the results were uneven. Terman observed that items from the Binet-Simon scale were too easy for 5-year-olds and too difficult for 12-year-olds. This caused the mental age of average 5-year-olds to be artificially high and that of average 12-year-olds to be artificially low. Working with his graduate student, H. G. Childs, Terman deleted existing items from the Binet- Simon scale and added new items until the average score of a sample of children was ______, no matter what their age. This meant that for each age group tested, the average ______ age would equal the group's ________ age.

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