Definition
The Wechsler Intelligence Scale for Children is a widely-used, standardised assessment of cognitive ability for children aged 6 to 16. The current UK edition is the WISC-V UK (Pearson, 2016), producing a Full Scale IQ and five primary index scores: Verbal Comprehension, Visual Spatial, Fluid Reasoning, Working Memory, and Processing Speed.
In context for parents
Key checkpoints
- The WISC-V UK (Pearson, 2016) is the most-used cognitive battery in UK educational psychology, ages 6 to 16.
- Produces a Full Scale IQ and five primary index scores: Verbal Comprehension, Visual Spatial, Fluid Reasoning, Working Memory, Processing Speed.
- Administration takes 60–90 minutes; restricted to qualified users (Chartered EP or Clinical Psychologist).
- Index scores matter more than the Full Scale IQ for SEND. "Spiky profile" is the typical SEND picture.
- Not a diagnostic test on its own for autism, ADHD, or dyslexia. One piece of evidence within a multi-disciplinary picture.
The WISC-V is the most-used cognitive battery in UK educational psychology. The administration takes around 60–90 minutes and must be carried out by a qualified user, typically a Chartered Educational Psychologist or Clinical Psychologist with relevant subtest training. The protected test materials are restricted to qualified users under the BPS test user policy.
The five index scores matter more than the Full Scale IQ for SEND. Verbal Comprehension measures vocabulary, verbal reasoning, and concept formation. Visual Spatial measures spatial reasoning and construction. Fluid Reasoning measures non-verbal abstract reasoning. Working Memory measures the ability to hold and manipulate information. Processing Speed measures speed and accuracy of visual scanning and motor output.
A "spiky profile" (significant differences between index scores) is the typical SEND picture and tells the story the Full Scale IQ flattens. An autistic child with Verbal Comprehension at the 80th centile and Processing Speed at the 5th centile has a Full Scale IQ in the average range; the spike-and-trough is the picture that matters. Dyslexia commonly shows a relative weakness in Working Memory and Processing Speed against stronger reasoning indices. ADHD often shows a Processing Speed and Working Memory dip. FASD frequently shows widely scattered subtest scores.
The WISC-V is not a diagnostic test for autism, ADHD, or dyslexia. It is one piece of evidence within a multi-disciplinary picture. A WISC-V profile suggestive of dyslexia should be followed by literacy attainment tests (WIAT-III UK or YARC); a profile suggestive of working-memory difficulty should be followed by deeper assessment of phonological processing and attention.
In an EHC needs assessment, the EP report typically includes WISC-V index scores or a justified rationale for using a different cognitive battery (BAS-3, the Brief Cognitive Abilities or similar where the WISC-V is not appropriate).
Related terms
The terms parents most often see alongside Wechsler Intelligence Scale for Children.
Educational Psychologist(EP)
A qualified psychologist who works with children, families, and schools to assess learning, development, and social-emotional needs. EP advice is a statutory part of EHC needs assessments.
Spiky Profile
A pattern of unusually uneven strengths and difficulties across cognitive or learning domains. Common in neurodivergent learners and often visible across WISC index scores.
Working Memory
The ability to hold and manipulate information in mind over short periods, for example following multi-step instructions or doing mental arithmetic. Often a key area of need in SEND.
Standardised Score
A score that compares a child's performance to a representative sample of the same age. The average is 100, with most children scoring between 85 and 115; scores below 70 or above 130 are unusual.
Where parents ask about this
Parents usually find this page after an EP report has come back with WISC-V scores and parents want to understand what they mean, or before commissioning an independent EP assessment. Searches include "WISC-V index scores explained", "what is a normal WISC-V score", and "WISC-V dyslexia profile". A Beaakon Independent EP can carry out a WISC-V assessment, interpret the profile in the context of the child's learning history, and write a tribunal-grade report.
References
The primary legislation, statutory guidance, research, and clinical tools this page draws on.
- Wechsler Intelligence Scale for Children, 5th edition UK (WISC-V UK): Pearson, 2016
- British Psychological Society: test user policy
- Health and Care Professions Council (HCPC): Practitioner Psychologist register
- BAS-3: British Ability Scales, 3rd edition (alternative cognitive battery)
- Children and Families Act 2014, section 36