Working Memory Assessment Scores, Explained
The US WISC-V has a Working Memory Index. As of 2026, its publisher says the index comes from Digit Span and Picture Span. Watkins and colleagues (2022) retested clinic children after about 2.6 years. The index was not among the most stable. We could read only the study's summary. Ask the person who tested your child what the score means.
TL;DR
- A working-memory score is one number from one test. The number alone does not tell you why a child finds something hard. Ask the person who tested your child what the score means.
- The US edition of the WISC-V has a Working Memory Index. As of 2026, its publisher says the index comes from two subtests. They are Digit Span and Picture Span. The publisher calls Picture Span a visual working-memory subtest. Ask the person who tested your child what the score means.
- Watkins and colleagues (2022) retested 225 children and teens at a clinic. The retest came about 2.6 years later. The Working Memory Index was not among the most stable scores. Gaps between a child's own scores were not stable either. We could read only the study's summary. Ask the person who tested your child what the score means.
- McGill and colleagues (2018) reviewed the practice of reading meaning into patterns of scores. They wrote that many studies have challenged how useful it is. We could read only the review's summary. The test's publisher and others take the other side. We did not get that side's sources. Ask the person who tested your child what the score means.
- In our reading, the person who gives this test is usually a psychologist. Ask the person who tested your child what the score means. Ask what they recommend. One score is something to talk through with them. It is not a conclusion on its own.
What one score cannot tell you
A working-memory score is one number from one test. The number alone does not tell you why a child finds something hard.
Nothing on this page rules anything in or out, and we are not able to.
Our rule is to describe patterns on these pages. We do not put a name on a child.
Ask the person who tested your child what the score means.
What the score is made of
On our pages, working memory means holding something in mind while you use it.
The US edition of the WISC-V has a Working Memory Index. As of 2026, its publisher says the index comes from two subtests. They are Digit Span and Picture Span.
The publisher calls Picture Span a visual working-memory subtest. The publisher says the index covers information a child sees and hears.
That make-up is for the US edition. As of 2026, the UK edition lists more working-memory subtests.
Grégoire (2024) describes the WISC-V index scale. On it, the average score is 100.
We could not obtain the test's manual.
We hold no description of how the Digit Span task is given.
Who gives the test
As of April 2026, the publisher's US policy limits who may buy the test. Buyers need a high level of skill in reading test results. That is a rule for buying the test. It is not a law about who may give it.
In our reading, the person who gives this test is usually a psychologist.
How steady the scores are
Watkins and colleagues (2022) retested 225 children and teens at a clinic. The retest came about 2.6 years later. The Working Memory Index was not among the most stable scores. Gaps between a child's own scores were not stable either. The overall score, the Full Scale IQ, was among the most stable scores. We could read only the study's summary.
The children were seen at a clinic, and the gap between tests was long.
The studies on this page are about groups of children.
Ask the person who tested your child what the score means.
A debate about patterns of scores
Canivez and colleagues (2017) reanalyzed the scores of 2,200 children. The WISC-V was built on these children. The authors questioned how much the index scores add beyond the overall score. We could read only the study's summary.
McGill and colleagues (2018) reviewed one way of reading scores. It looks for meaning in patterns of scores. The authors wrote that many studies have challenged how useful it is. We could read only the review's summary.
These authors are on one side of a debate. The test's publisher and others take the other side. We did not get that side's sources. In our reading, the debate is not settled.
Ask the person who tested your child what the score means.
What a low score does not show
No source on this page says a low score names a learning difficulty. No source on this page says a score shows how to teach a child.
We hold no cut-off for a low working-memory score.
Ask the person who tested your child what the score means.
What to ask
Ask the person who tested your child what the score means. Ask what they recommend. One score is something to talk through with them. It is not a conclusion on its own.
Ask what the test measures, and what it does not.
Our page on auditory and visual working memory has more.
When to ask for help
Each of these is a reason to ask for help on its own.
- Little change, even with steady practice and good teaching.
- Schoolwork well below what school expects.
- A teacher who raises a concern about learning.
- Extreme upset about schoolwork.
- Complete avoidance of school or learning.
- Hopelessness about learning.
- Sadness or worry that lasts.
- Significant delays in speech, language or motor development.
- A skill that was there and has gone. Our position is that a lost skill goes to a doctor first, not a tutor.
If no skill has gone, start with the teacher. Say what you are seeing at home, and what you have tried. Beyond the teacher, the right person depends on what it turns out to be about. If the work is too hard, someone who works on that school skill. If worry or mood is the thing, someone who works with children's mental health. In our view, delays in speech, language or movement are worth raising with your child's doctor. In our view, if you are worried enough to ask, a professional evaluation is worth asking about.
Any talk of hurting themselves is a same-day call to your doctor or a crisis line.
In the classroom
If a family shares a working-memory score, ask what the tester recommended.
Describe what you see in class, not the score.
Tonight, write down each score you have been given, and who gave it. Next to each, write one question: what does it mean for my child? This is a record, not a test.
”What to do tonightWhat to use next
An overview of processing skills. Our work on each runs alongside reading, spelling or math instruction, not in place of it.
Common questions from parents
What does a low WISC working memory index mean?
We cannot tell you what a low score means for your child. The US edition of the WISC-V has a Working Memory Index. As of 2026, its publisher says the index comes from two subtests. They are Digit Span and Picture Span. No source on this page says a low score names a learning difficulty. Ask the person who tested your child what the score means. Ask what they recommend.
What does a Digit Span score mean?
The US edition of the WISC-V has a Working Memory Index. As of 2026, its publisher says the index comes from two subtests. They are Digit Span and Picture Span. We hold no description of how the Digit Span task is given. One score is something to talk through with the person who tested your child. Ask the person who tested your child what the score means.
My child's working memory score is low but IQ is high. What does that mean?
We cannot tell you what a gap means for your child. Watkins and colleagues (2022) retested 225 children and teens at a clinic. The retest came about 2.6 years later. Gaps between a child's own scores were not stable over that time. We could read only the study's summary. The studies on this page are about groups of children. Ask the person who tested your child what the gap means.