That is, because the only Wechsler test that can be viewed as measuring sequential processing is Digit Span Forward ( Das et al., 1994) but the Digit Span subtest score includes Backwards span which involves more than sequential processing ( Schofield & Ashman, 1986), there is no efficient measure of sequential processing on the Wechs-ler. However, two Simultaneous subtests (Matrix Analogies and Photo Series), involve more reasoning (and load on two of Woodcock's (1990) factors: Fluid Reasoning (Gf) and Visual Processing (Gv)) than Wechsler's Performance subtests: The Sequential Processing Scale of the K-ABC is an excellent addition to the Wechsler because it measures sequential processing more efficiently than any Wechsler subtest. The K-ABC Simultaneous Processing Scale is believed by some researchers to involve the same cognitive requirements as Wechsler's Performance Scale ( Das, Naglieri, & Kirby, 1994) and by others to be a measure of Visual Processing (Gv) ( Horn, 1991). The K-ABC measures some of the same abilities as the WISC-III and WPPSI-R, but also measures ability in ways that are different from the Wechsler scales, thereby contributing unique information about a child's cognitive functioning. Lichtenberger, in Comprehensive Clinical Psychology, 1998 4.08.3.1 K-ABC Integration with Wechsler Scales

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