A method for calculating "standardized" grade equivalents for learning disabled students is criticized because it recreates some problems of the original mental age concept and has little to offer teachers or diagnostic personnel. (Author/CL)

The Peabody Individual Achievement Test was factor analyzed at five grade levels. Subtests composing each factor changed from the lower to upper grade levels, but abilities measured by each factor appeared constant. A close similarity between the two factors and Cattell's concept of fluid and crystallized intelligence was noted. (Author)

The use of grade equivalent scores contrasted against grade placement is widespread in the diagnosis of dyslexia and other reading disabilities. Discusses difficulties and distortions of this method. Presents an alternative method for reliably determining aptitude/achievement discrepancies. (Author)