This document discusses the evolution of educational placements for students with disabilities. It begins by defining terms like mainstreaming, least restrictive environment, and inclusion. Mainstreaming involves part-time placement in general classes, while inclusion aims for students to be served primarily in general education. The least restrictive environment concept requires students be educated as close to general classrooms as possible. More recently, there has been a shift toward full inclusion models where students are educated exclusively in age-appropriate general classrooms with appropriate supports. The document also outlines components and best practices for inclusion, such as preparation, implementation, evaluation, collaboration, individualization and a focus on diversity.