Three CPTED Strategies

Natural Surveillance
Surveillance is a design concept directed
primarily at keeping intruders under observation.
Therefore, the primary thrust of a surveillance strategy
is to facilitate observation and to accomplish the effect
of an increased perception of risk. Surveillance
strategies are typically classified as organized (e.g.,
police patrol) mechanical (e.g., lighting) and natural
(e.g., windows).

Natural Access Control
Access control strategies are typically classified as
organized (e.g., guards), mechanical (e.g., locks), and
natural (e.g., spatial definition). This lesson plan
outline will concentrate on the third strategy of
natural access control. The primary thrust of an
access control strategy is to deny access to a crime
target and to create a perception of risk in offenders.

Territorial Reinforcement
The concept of territoriality suggests that
physical design can contribute to a sense of
territoriality. That is, physical design can create or
extend a sphere of territorial influence so potential
offenders perceive that territorial influence. For
example: low walls, landscape and paving patterns to
clearly define the space around a unit entry as
belonging to (and the responsibility of ) the residents
of that unit.