Abstract
A shift in school psychologists' diagnostic perspective — from a focus on learning disabilities to curriculum disabilities — is suggested. This shift is essential because curriculum disabilities might be a leading cause of the pervasive failure of diverse learners whose numbers are increasing in America's schools. Pivotal to understanding curriculum disabilities is knowledge about three classes of educational tools (e.g., textbooks, electronic technology, and other media) that strongly influence teaching and learning in classrooms: (a) prevailing, (b) emerging, and (c) research-based. These three classes of educational tools are explained and the implications of their use for diverse learners are discussed.

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