2. Wechsler Intelligence Scale for Children Short Form (WISC-III short form) WISC-III (Wechsler, 1991) is a well established scale designed to assess the Full-Scale IQ (FSIQ) of children under age of 16. It includes 13 subtests to test children's cognitive ability of different dimensions. Test result is represented by Verbal IQ, Performance IQ, and Full-Scale IQ. The present research conducted a quad combination of WISC short form including subtests of Symbol Search, Arithmetic, Block Design, and Verbal. Previous research suggested the mentioned combination have good reliability (rxx = .91) and validity (rxx = .90) (Silverstein, 1982), and is preferred while conducting research to estimate FSIQ.