This digest describes the key elements of Crime Prevention Through Environmental Design (CPTED). CPTED is based on the recognition that the physical environment influences human behavior. It is different from conventional security measures, which many times are based on prohibitions, in that it focuses on desired behaviors and attempts to solve problems by changing the physical and social environment and by reinforcing positive behavior. The core elements of CPTED include natural surveillance, in which the whole environment can be viewed; natural access control to determine who can and cannot enter a facility; and territoriality, in which an established control is exerted over the environment. A CPTED analysis of a school evaluates crime rates, office-referral data, school cohesiveness and stability, as well as shortcomings in school design. Naturally, it is more efficient to integrate CPTED during an expansion or new construction, so it is important to integrate CPTED into school planning. When considering a CPTED analysis, school officials should look to professionals for an assessment. These assessments include crime mapping; reports from local police and medical centers; surveys of parents, teachers, and students; inspection of the campus and its surroundings, and an analysis of the surrounding neighborhood. (RJM)