Tests of general intelligence

Among the best-established tests are the Stanford-Binet—fifth edition (SB-5; Roid, 2003); the Differential Abilities Scale (DAS-II; Elliot, 2007) and its UK counterpart the British Abilities Scale (BAS-3; Elliot & Smith, 2011) and the suite of Wechsler tests (Wechsler Preschool and Primary Scale of Intelligence—fourth edition (WPPSI-IV; Wechsler, 2012); Wechsler Intelligence Scale for Children—fourth edition (WISC-IV; Wechsler, 2003); Wechsler Adult Intelligence Scale—fourth edition (WAIS-IV; Wechsler, 2008)).

Test Age range (years:months) Key Standardized scores/subscales

General Intelligence tests British Abilities Scale—third edition (BAS-3; Elliot & Smith, 2011)

3:00 to 17:11

General conceptual ability Verbal ability Non-verbal reasoning ability Spatial ability Special non-verbal composite

Differential Abilities Scale—second edition (DAS-II; Elliot, 2007)

2:6 to 17:11

General conceptual ability score Verbal ability Non-verbal reasoning ability Spatial ability Special non-verbal composite

Stanford-Binet—fifth edition (SB-5; Roid, 2003)

2:00 to 85+

Full scale IQ Verbal IQ Non-verbal IQ Brief IQ 5

Factors scores: fluid, knowledge, quantitative, visual-spatial, and working memory

Wechsler Preschool and Primary Scale of Intelligence—fourth edition (WPPSI-IV; Wechsler, 2012)

2:6 to 7:7