About the Measure
| Domains | Omnibus |
| Subscales | Full scale, verbal comprehension, visuo-spatial, fluid reasoning, working memory and processing speed. |
| Target Construct | Oral language: Receptive vocabulary, picture naming |
| Description | General intelligence scale including verbal reasoning |
| Test Authors | Wechsler , D. |
| Publisher | Pearson (2013) |
| Psychometry | |
| Implementation |
Implementation details
| Respondent | Child |
| Prior knowledge Required | Professionals or trained administrators, CL1 |
| Scoring | Scoring clear and transparent, need to distinguish raw scale standard scores and norms |
| Time | 30 to 45 minutes for children younger than 3 years and 11 months and 45 to 60 minutes for older children. |
| Age | 2 years and six months to 7 years and 3 months |
Psychometric details
| UK norms | YES |
| Norm / Criterion referenced | Norm referenced |
| Standardisation sample | 805 children in UK; 2100 (1700 + 400 for items bias in US |
| Reliability | Test-retest 0.90; inter rater 0.96; Cronbach PIQ 0.92, VIQ 0.95 and FSIQ 0.96 |
| Criterion validity | Insufficient data in the public domain to evaluate |
| Construct validity | PIQ and VIQ as distinct dimensions |
| Concurrent validity | Significant correlations with WISC-R; Stanford-Binet and McCarthy Scales |