Intelligence is a trait or set of traits on which individuals differ. Not an abstract measure: early binet-simon test. To determine intelligence, they sought to examine items that were correlated with high teacher ratings. From this they developed the binet-simon test of intelligence, which gave a score in terms of the child"s mental level (also referred to as mental age: compare relative age in terms of performance and intelligence. These tests were eventually modified in the u. s. a. to become the stanford-binet test. This test reported test scores in terms of intelligent quotient (iq), which was a function of the mental age of the child divided by their actual physical age. Adult version is the wais-iii, child version is the wisc-iii. Measure for targeting children before falling behind. Stanford-binet intelligence scale: intelligence quotient calculated as. Iq = mental age/chronological age *100, but all modern tests now use deviation iqs. The wechsler scales: wppsi iii, wisc iv.