Was the WISC–IV UK designed to follow the CHC factors?
The development of the WISC–IV UK was significantly influenced by current research into neurocognitive information processing models, and the creation of new subtests was equally guided by clinical research and factorial data. The Wechsler four-factor structure was first introduced as an option within the WISC–III UK (1991) and subsequently included in the WAIS–III (1997). The WISC–IV (2003) strengthens the Wechsler four- factor model, and removes its status as optional. Nonetheless, the WISC–IV UK subtests measure constructs that could be described using common CHC terms such as fluid reasoning (MR, PCn, SI, WR), quantitative knowledge (AR), crystallised knowledge (IN, VC), short term memory (DS, LN, AR), visual processing (PC, BD), long-term storage and retrieval (IN, VC), and processing speed (CD, SS, CA).
