The Montessori School of McLean (MSM) is a dedicated Montessori School that has been educating children since 1973. MSM enrolls children that are age three by December 31st of their incoming year, through age twelve. Children up to age six are enrolled in mixed-age groups in our four pre-school/kindergarten classes. The elementary program (comparable to first through sixth grade) is also arranged in mixed-age classes: ages five and a half to nine years in lower elementary, and ages nine to twelve in upper elementary. Our school has approximately one hundred children in the preschool and approximately sixty five children in the elementary program.