Definitions of least restrictive environment (LRE), inclusive education, and mainstreaming are offered, supported by position statements and policies of the Michigan Board of Education, Michigan Department of Education, and the Council for Exceptional Children. Thirty-six terms related to inclusive education, such as integrated education and community inclusion advocacy, are listed. Federal and Michigan statutes and regulations regarding LRE are cited. A bibliography of monographs, periodical articles, and reports listed approximately 500 citations on LRE, divided into a section of contemporary literature and a section of historical (pre-Public Law 94-142) literature. A directory of organizational and individual resources concludes the document. (JDD)