The rationale behind Public Law 94-142, which pertains to education of handicapped children, is presented. Key terms such as mainstreaming, least restrictive environment, zero reject, most appropriate placement, and individualized education are discussed to clarify their significance for educators. (PP)

Discussion of the principle of least restrictive environment (LRE) in the Individuals with Disabilities Education Act (IDEA) reviews sociopolitical, legal, and educational data. The article suggests that concerns about LRE placement have obscured the preeminent issue of free and appropriate instruction, another IDEA principle. Some principles of…