21 subtests on three shelves
A standard administration uses the ten primary subtests: seven for the Full Scale IQ and three more to complete five two-subtest indexes. Ancillary and complementary indexes regroup the rest for specific clinical questions.1
Working memory stops being all spoken
In the WISC-IV, both working memory index subtests were read aloud. The WISC-V replaced one of them with a visual task.2
Digit Span now asks for numbers in ascending order as well as forwards and backwards, a condition adapted from the WAIS-IV.12 Letter-Number Sequencing stayed on as a secondary subtest.12
Same ten subtests, three readings
Switch between the publisher's model and the ones independent researchers argued for, and watch where the ten primary subtests go.
Subtest placements follow the publisher's primary-index structure.3 In the four-factor view, Visual Spatial and Fluid Reasoning are merged back into Perceptual Reasoning, as in the independent studies.5,8 Omega values are ranges reported across several independent analyses.9
2,200 children in 33 four-month steps
The sample was stratified by age, sex, race/ethnicity, parental education and region.6 It was divided into one age band per four months of age, with about 67 children in each.5
References
- [1]Wechsler Intelligence Scale for Children, Fifth Edition: product features and FAQs. Pearson Clinical.pearsonclinical.com
- [2]WISC-V-CDN frequently asked questions. Pearson Clinical Canada (PDF).pearsonclinical.ca
- [3]Discover the power of WISC-V (brochure). Pearson, via ASPP (PDF).aspponline.org
- [4]Wechsler Intelligence Scale for Children, Fifth UK Edition (brochure). Pearson Clinical UK, 2019 (PDF).pearsonclinical.co.uk
- [5]Wechsler Intelligence Scale for Children: an overview. ScienceDirect Topics (Psychology).sciencedirect.com
- [6]Canivez, G. L., Watkins, M. W., & Dombrowski, S. C. (2016). Factor structure of the Wechsler Intelligence Scale for Children–Fifth Edition: exploratory factor analyses with the 16 primary and secondary subtests. Psychological Assessment (PDF).ux1.eiu.edu
- [7]Canivez, G. L., Dombrowski, S. C., & Watkins, M. W. (2018). Factor structure of the WISC-V in four standardization age groups. Psychology in the Schools 55(7), 741–769. ERIC EJ1184099.eric.ed.gov
- [8]Canivez, G. L., et al. (2020). Construct validity of the WISC-V in clinical cases: exploratory and confirmatory factor analyses of the 10 primary subtests. Assessment 27(2), 274–296 (PDF).ux1.eiu.edu
- [9]McGill, R. J., et al. Construct validity of the WISC-V UK (manuscript, PDF).rjmcgill.com
- [10]WISC-V: age range, index scores and scoring. Cogn-IQ encyclopedia (2026).cogn-iq.org
- [11]Clinical utility of the WISC-V (conference handout). Texas Psychological Association (PDF).tpaonline.org
- [12]Digit Span: an overview (WISC-V). ScienceDirect Topics.sciencedirect.com
Related historical tests
The WISC-IV combined Block Design, Matrix Reasoning and Picture Concepts into one Perceptual Reasoning index. The WISC-V split that index in two, and most of the later factor debate is about whether that split holds up.
Visual Puzzles and Figure Weights first appeared in the adult Wechsler. The WISC-V adapted them for children and gave each one its own index.
The preschool Wechsler already reported separate Visual Spatial and Fluid Reasoning indexes for ages 4:0–7:7. The WISC-V extended that structure to children aged 6 to 16.
The fifth adult edition came a decade after the WISC-V and revised the adult structure again. Together, the two show how far the Wechsler tests have moved from the old Verbal/Performance split.
The 1949 WISC reported only Verbal, Performance and Full Scale IQs. Block Design, Similarities, Vocabulary, Digit Span and Coding are still in the WISC-V's Full Scale IQ 65 years later.