A national achievement test can help you see how a child performs on a sample of academic skills. It cannot replace looking closely at the work the child is ready to learn next.
These assessments are used beyond a single state and may be found in schools or homeschool testing services. “Nationally normed” describes a comparison group, not a nationwide requirement that every family must use the test. This guide explains the assessments; it does not tell you which test satisfies a particular reporting rule.
Iowa Assessments and the ITBS name
Families may use “Iowa,” “Iowa Assessments,” or the older Iowa Tests of Basic Skills (ITBS) name in conversation. Do not assume those labels identify the same form or norm set. Ask the provider for the exact title, level, form, and norm year on the order and report.
The Iowa family measures academic achievement across subjects, with the actual coverage depending on the level and battery. Ask which subjects are included before choosing a shorter survey or a more extensive option.
Stanford Achievement Test, Tenth Edition
Stanford 10, also called SAT10, is a nationally normed achievement assessment. It is not the college-admissions SAT. Pearson offers different formats and levels; the tested areas depend on what is administered. It can also be used with OLSAT 8 for an ability–achievement comparison.
TerraNova
TerraNova is an achievement-test family from Data Recognition Corporation. The edition matters: the publisher describes TerraNova Third Edition with 2017 national norms. Ask whether you are receiving a complete assessment or another battery and which norm information the scoring service will use.
California Achievement Test
Despite its name, the California Achievement Test (CAT) is not simply a current California state assessment. Providers offer specific versions, and some use older norms. For example, Seton describes its CAT E/Survey as using 1986 norms. TerraNova 2 is also associated with the CAT 6 name. The acronym alone is not enough to identify the assessment.
In other testing conversations, CAT means computer-adaptive test. That is a testing method, not necessarily the California Achievement Test. Check which meaning the speaker intends.
Three score misunderstandings to avoid
- “The 80th percentile means 80 percent correct.”
- No. A percentile describes relative standing in the stated norm group. It is not the raw percentage of items answered correctly.
- “A grade equivalent of 7.2 means my fourth grader should start seventh-grade work.”
- Not by itself. A grade-equivalent score describes performance relative to a reference group on that test. It does not establish mastery of an entire older-grade curriculum.
- “The overall score tells us everything important.”
- A composite can hide differences among subjects or skills. Review the component results alongside work samples and the child’s learning history.
Before you order or schedule
Ask about the exact edition and norms, included subjects, administration requirements, timing, access arrangements, scoring period, and what the report will contain. If you need results for a specific organization, confirm its requirements directly before paying. A test’s availability through a service is not a guarantee that every program accepts it.
Bring this question
“What can this result help us decide, and what would we still need to observe or assess?”
Sources & further reading
Publisher and developer information checked November 2, 2026. Names, editions, and report formats can change.