Breaking the plane
Breaking the plane is a term coined by Doug Lemov, a researcher and observer of educational methods. It refers to an instructor in a large classroom setting destroying the implicit assumption that he or she has access only to the part of the classroom close to the board. Lemov recommends that the instructor must break the plane within the first five minutes of class and assert his or her authority to move around freely within the classroom. This facilitates the checking of in-class desk work as well as any behavior correction necessary without creating a big scene.