The Stanford-Binet was the first standardized test designed to measure intelligence. Originally designed by Alfred Binet, in France, to identify learning-impairments in children in early 1900s, it has been updated many times with the goal of decreasing cultural bias. The Stanford-Binet is meant for people ages 2 to 23, and measures general intelligence although it focuses specifically on verbal, quantitative, abstract and visual reasoning as well as short-term memory.
The WISC-III or third edition is currently the most commonly used intelligence test for children. When it was originally created in 1949 it was modeled after World War II Army intelligence tests. It is meant for children age's 4 and a half to 6 and focuses on areas of language and perception.
The K-ABC was developed in the 1980s as an alternative to the WISC and Stanford-Binet. This test built on the idea of childhood intelligence as it was measured in previous tests, expanding on what were considered traditional measures of childhood intelligence.
The McCarthy Scales are meant to test the general intelligence levels of children age's 2 and a half to 8 and a half. This scale looks at verbal, perceptual, performance and quantitative abilities as well as memory, motor skills and general cognition.
The CAS is unique in that it can differentiate between children with different conditions and help teachers to design particular interventions based on the child's need. It also overcomes some of the biases of past tests by being able to measure children's abilities even when their cultural backgrounds are diverse.