History
The original WPPSI (Wechsler, 1967) was developed as an intelligence measure for 4-6:6yr olds in response to an increasing need for the assessment of preschoolers. The WPPSI was divided into eleven subtests, all of which were retained in the revision in 1989. The WPPSI-R expanded the age range to 3–7 years 3 months and introduced a new subtest, Object Assembly. WPPSI-III incorporates a number of significant changes. Additional subtests have been designed to enhance the measurement of Fluid Reasoning (see Carroll, 1997) these are; Matrix Reasoning, Picture Concepts and Word Reasoning. Measures of Processing Speed have also been taken from the WISC-III, adapted for use with younger children and included as new subtests (Coding & Symbol Search). The age range has not only been lowered to 2 years 6 months but it has also been divided into two bands: 2 years 6months - 3years 11 months and 4–7 years 3 months, this was done in recognition of the substantial changes in cognitive development that occur during early childhood.
Read more about this topic: Wechsler Preschool And Primary Scale Of Intelligence
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