This paper briefly addresses critical issues in documenting studies of the effectiveness of inclusive education for students with disabilities and includes a summary table of the existing literature and guidelines for problem solving about inclusion. The importance of sound methodology in documenting effects of inclusion and the dangers of value judgments regarding placements are stressed. Ten parameters that investigations of inclusion should cover are outlined, including achievement gains, social skill growth, opportunities for social integration, attendance, time on task, extent to which practices are embedded in routines, fidelity of practices, quality of Individualized Education Programs, longitudinal focus, and extent of parent participation. Attached are: a matrix summarizing results of 12 inclusion effectiveness studies; an outline of principles of brainstorming; a summary of steps involved in using creative problem solving to define and measure inclusion; and a listing of ideas concerning measurement of inclusion efforts, generated at two brainstorming sessions. (Contains 9 references.) (DB)