Woodcock-Johnson IV (WJ IV) emphasizes the identification of strengths and weaknesses by providing comparisons within and across each of its three co-normed batteries. This complete assessment system offers the ease of use and flexibility examiners need to evaluate learning problems and improve instructional outcomes for children and adults in a way that no other assessment can.
Standard Score and Percentile Rank Classification Table
In addition to norm-referenced scores (such as Standard Scores and Percentile Ranks), the WJ IV provides Relative Proficiency Index (RPI) scores, which describe an examinee’s proficiency with age-level tasks. The table below classifies RPI ranges into six proficiency bands, from Very Advanced (RPI 100/90 or above) through Extremely Impaired (RPI below 3/90); a lower RPI indicates greater difficulty with tasks that same-age peers handle easily. This same classification applies to Standard Score and Percentile Rank ranges for the WJ IV Tests of Achievement, Cognitive Abilities, and Oral Language.ency with age-level tasks.
The score interpretations below are valid for the WJ IV Tests of Achievement, Tests of Cognitive Abilities, and Tests of Oral Language results.