Woodcock-Johnson V vs IV Differences

The Biggest Update in the Test's History

The Woodcock-Johnson V (WJ V), released in February 2025, is not a minor revision. It's a full overhaul — new administration format, new norming sample, new subtests, and restructured clusters. If your child was tested on the WJ IV and is being retested on the WJ V, or if you're comparing a school evaluation (WJ IV) with a private evaluation (WJ V), the differences matter.

Digital-Only Administration

The WJ IV used paper easel stimulus books — the evaluator flipped pages while the child responded verbally or pointed. The WJ V is entirely digital, administered through a browser-based platform using an examiner laptop and an examinee tablet (typically an iPad).

For parents, this means:

• The testing experience is different. Some children perform better with a digital interface; others find it less comfortable than paper.
• Behavioral observations during testing may look different. A child's interaction with a tablet vs. a paper booklet can affect pacing, attention, and error patterns.
• If your child was tested on the WJ IV previously and is now retested on the WJ V, the format change alone can influence scores — independent of any real change in ability.

Updated Norming Sample

The WJ IV's norms were based on a pre-pandemic sample. The WJ V normed on 5,837 individuals ages 3 to 90+, tested between February 2022 and August 2023. This is the first major achievement test normed entirely with post-pandemic data.

Why it matters: academic performance shifted after extended remote learning. A child who scored at the 40th percentile against WJ IV norms (pre-pandemic peers) might score at the 45th or 50th percentile against WJ V norms (post-pandemic peers) — or vice versa, depending on the skill area. The norming sample isn't better or worse; it's different.

When comparing scores across editions, expect some movement even if the child's actual skills haven't changed.

New Achievement Subtests

The WJ V added tests that didn't exist on the WJ IV:

• Sentence Writing Accuracy: Adds a separate measure of sentence structure, capitalization, and punctuation alongside Writing Samples. The WJ IV did not include this separate measure.
• Math Problem Identification: Tests whether a child can figure out what operation a word problem requires, separate from executing the calculation. This fills a gap the WJ IV had — Applied Problems tested both the reasoning and the execution, making it hard to tell which part was breaking down.

These additions give evaluators sharper tools for pinpointing where a breakdown occurs. For parents, it means the WJ V report may include subtests you won't find on an older WJ IV report — and those new subtests might reveal problems that the WJ IV structure couldn't isolate.

Restructured Cognitive Clusters

On the cognitive side (which often accompanies the achievement battery in a full evaluation), the WJ V made two notable structural changes:

• Long-Term Retrieval split in two: The WJ IV had one broad cluster for long-term retrieval (Glr). The WJ V separates this into Long-Term Storage (Gl) and Retrieval Fluency (Gr). A child who stores information adequately but can't retrieve it quickly now shows that pattern more clearly.
• Processing Speed update: The WJ IV used Pair Cancellation (a visual search task). The WJ V replaced it with Symbol Inhibition, a speeded task measuring executive response inhibition — the ability to stop an automatic response.

The Dyslexia Test Set

The WJ V introduced a purpose-built Dyslexia Test Set with integrated teacher and parent behavioral checklists. The WJ IV required cross-battery comparisons and clinical judgment to flag dyslexia; the WJ V builds the screening into the battery itself. If your child's evaluator used this set, ask for the results specifically — it may not appear in the standard score tables.

What This Means for Retesting

If your child is being retested and the switch is from WJ IV to WJ V, be aware of three things:

1. Score comparisons across editions are approximate. Different norming samples, administration formats, and subtest structures make direct score-to-score comparison imprecise. Do not attribute a specific point change to the edition alone; interpret the results with the evaluator and the other available information.
2. New subtests may reveal things the old edition missed. Math Problem Identification and Sentence Writing Accuracy can expose weaknesses that were blended into broader composites on the WJ IV.
3. Practice effects still matter. A different edition changes the format and test structure, but that does not by itself establish that practice effects are absent. Standardized achievement batteries generally require a 12-month interval between administrations to maintain score validity.

The Achievement Test Decoder covers both the WJ IV and WJ V, mapping the structural changes so you can understand your child's report regardless of which edition was used.