The U.S. Department of Education’s Office of Special Education Programs (OSEP) per IDEA 2004 requires that states monitor the implementation of the Least Restrictive Environment requirement of IDEA and report the overall proportion of students educated in a number of educational placement categories from each LEA compared to state targets for these placement categories.

More from IDOE's website:   http://www.doe.in.gov/specialed/indicator-5-least-restrictive-environment-lre