About the Measure

Domains Omnibus
Subscales Core scales verbal ability, non-verbal reasoning and spatial ability- separate scores for naming vocabulary, early number concepts
Target Construct Oral language: Receptive and expressive language skills at the word level. Numeracy: Early number concepts
Description The British Ability Scales (BAS) has long been established as a leading standardised battery in the UK for assessing a child’s cognitive ability and educational achievement. Comprising 20 shorts tests, each measuring particular types of knowledge, thinking and/or skills, BAS3 remains unique in the range of measurement facilities it offers and the variety of scales it includes.
Test Authors Elliot, Smith & McCulloch, 2004 (original test)
Publisher GL Assessment (2004)

Implementation details

Respondent Child
Prior knowledge Required Individually administered by educational and clinical psychologists
Scoring Scoring clear and transparent, need to distinguish raw scores, ability scores and t scores. Online scoring system available
Time 30 to 45 minutes
Age 3 years to 8 years and 11 months.

Psychometric details

UK norms YES
Norm / Criterion referenced Norm referenced: Norms for separate subscales
Standardisation sample 1480
Reliability It proved impractical to obtain test-retest data for the Early years scales. Robust evidence of test-retest stability is available for DAS II with coefficients ranging .63 to .92.
Criterion validity Co-normed with the York Assessment of Reading for Comprehension: Early years and passage reading primary.
Construct validity Intercorrelations of Core Cognitive Scales and Composites ranged .49 to 1
Concurrent validity Reported for earlier versions of the test but data was not available at the time of review for the current test