The WIAT-III is an individual assessment of academic achievement for students from the age of 4 till 50 years 11 months. The WIAT-III encompasses a broad range of academic skills such as Reading, Writing, Mathematics and Oral Language. It evaluates these various aspects of academic achievement by having the child engage in a variety of tasks. These tasks are divided into three scales, the Reading Scale, Mathematics Scale and Written Language Scale. Results are reported as Percentile Ranks (PR) and broad descriptors. PR represents where a child scored in comparison to children of the same age group, eg, a PR=50 means a child performed better than 50 of 100 students of the same age. Percentile ranks between 25 and 75 are in the average range.