The Woodcock-Johnson Tests of Achievement are long-standing tests used to determine how well a student is retaining and understanding certain subjects. The subjects tested are specifically selected to reflect a student’s knowledge of “core” or very important topics. There are currently two versions of the Woodcock-Johnson Tests of Achievement being used; versions three and four.
Originally developed in the late 1970s, the Woodcock-Johnson® Tests of Cognitive Abilities are unique and important in that they assess cognitive function. This is very different from learned knowledge and indicates a person's ability to learn and reason, regardless of previous schooling.