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History
The Defensible Space Theory of architect and city planner Oscar Newman encompasses ideas about crime prevention and neighborhood safety. The theory developed in the early 1970’s, and he wrote his first book on the topic, Defensible Space  in 1972. The book contains a study from New York that pointed out that higher crime rate existed in high-rise apartment buildings than in lower housing projects. This, he discovered, was because residents felt no control or personal responsibility for an area occupied by so many people. Throughout his study, Newman focused on explaining his ideas on social control, crime prevention, and public health in relation to community design.

Theory
As defined in Newman’s book Design Guidelines for Creating Defensible Space, defensible space is defined as “a term used to describe a residential environment whose physical characteristics—building layout and site plan—function to allow inhabitants themselves to become key agents in ensuring their security.” He goes on to explain that a housing development is only defensible if residents intend to adopt this role, which is defined by good design. “Defensible space therefore is a sociophysical phenomenon,” says Newman. Both society and physical elements are both parts of a successful defensible space.

The theory argues that an area is safer when people feel a sense of ownership and responsibility for that piece of a community. Newman asserts that “the criminal is isolated because his turf is removed” when each space in an area is owned and cared for by a responsible party. If an intruder can sense a watchful community, he feels less secure committing his crime.

Intention
The intention of physical features is to create a sense territorialism in community members which will ensure a safe living environment for those that care for it. Defensible space works with a hierarchy of living and community spaces. According to the theory, housing developments that evoke territorialism are “the strongest deterrents to criminal and vandal activity.” Housing should be grouped in such a way that members feel a mutual benefit. Also to deter crime, areas should be defined for function, paths should be defined for movement, outdoor areas should be juxtaposed with homes, and indoor spaces should visually provide for close watch of outside areas.

Newman holds that through good design, people should not only feel comfortable questioning what is happening in their surroundings, but they should feel obligated to do so. Any intruder should be able to sense the existence of a watchful community and avoid the situation altogether. Criminals fear the likelihood that a resident, upon viewing the intrusion, would then question their actions. This is highly effective in neighborhoods that cannot afford a professional crime watch.

The Defensible Space Theory is applicable to any type of planned space. From low density housing to high rises, the key is the development of a communal area in which residents can “extend the realm of their homes and the zone of felt responsibility.” Circulation paths and common entry are important aspects of defensible design as well. Residents must also feel a need to extend their protective attitudes to locations where property and urban streets and surroundings connect. The interfacing between private property and community space should be protected similarly. Newman’s intent in creating the principals of defensible space are to give the residents of a community control of public spaces that they formerly felt were out of reach. In effect, residents care enough for their area to protect it from crime as they would protect their own private property.

Principles
Oscar Newman’s basic four principles of designing defensible space as quoted in Design Guidelines for Creating Defensible Guidelines are as follows:

1.	The assignment to different resident groups the specific environments they are best able to utilize and control, as determined by their ages, life-styles, socializing proclivities, backgrounds, incomes, and family structures.

2.	The territorial definition of space in residential developments to reflect the zone of influence of specific inhabitants. Residential environments should be subdivided into zones toward which adjacent residents can easily adopt proprietary attitudes.

3.	The juxtaposition of dwelling interiors with exterior spaces and the placement of windows to allow residents to naturally survey the exterior and interior public areas of their living environments and the areas assigned for their use.

4.	The juxtaposition of dwellings—their entries and amenities—with city streets so as to incorporate the streets within the sphere of influence of the residential environment.

5.	The adoption of building forms and idioms that avoids the stigma of peculiarity that allows others to perceive the vulnerability and isolation of a particular group of inhabitants.

To create a defensible space community, residential areas should be subdivided into smaller entities of similar families because control is enhanced. Responsibility for the area is more easily assumed in a smaller group of families as opposed to a larger community. Smaller groups more frequently use an area geared toward them. The number of activities in the space is increased; thus, a feeling of ownership and a need to protect the property follows. On the other hand, when larger groups use a community space, no one has control over the area, and an agreement over its acceptable uses is often in dispute.

Today
Oscar Newman’s Defensible Space Theory was largely popular in city design from it’s emergence until the 1980’s. Some of his basic ideas are still taken into consideration presently, however. Although changes were made in the implementation of the theory in the 1990’s, Newman’s basic principals still exist in design.