Crime prevention through environmental design (CPTED) is an agenda for manipulating the built environment to create safer neighborhoods. It originated in America around 1960, when urban renewal strategies were felt to be destroying the social framework needed for self-policing. Architect Oscar Newman created the concept of ‘defensible space’, developed further by criminologist C. Ray Jeffery who coined the term CPTED. Growing interest in environmental criminology led to detailed study of specific topics such as natural surveillance, access control and territoriality. The "broken window" principle that neglected zones invite crime reinforced the need for good property maintenance to assert visible ownership of space. Appropriate environmental design can also increase the perceived likelihood of detection and apprehension, known to be the biggest single deterrent to crime. There has also been new interest in the interior design of prisons as an environment that significantly affects decisions to offend. Wide-ranging recommendations to architects include the planting of trees and shrubs, the elimination of escape routes, the correct use of lighting, and the encouragement of pedestrian and bicycle traffic in streets. Tests show that the application of CPTED measures overwhelmingly reduces criminal activity. History CPTED was originally coined and formulated by criminologist C. Ray Jeffery. A more limited approach, termed defensible space, was developed concurrently by architect Oscar Newman. Both men built on the previous work of Elizabeth Wood, Jane Jacobs and Schlomo Angel. Jeffery's book, "Crime Prevention Through Environmental Design" came out in 1971, but his work was ignored throughout the 1970s. Newman's book, "Defensible Space: – Crime Prevention through Urban Design" came out in 1972. His principles were widely adopted but with mixed success. The defensible space approach was subsequently revised with additional built environment approaches supported by CPTED. Newman represented this as CPTED and credited Jeffery as the originator of the CPTED term. Newman's CPTED-improved defensible space approach enjoyed broader success and resulted in a reexamination of Jeffery's work. Jeffery continued to expand the multi-disciplinary aspects of the approach, advances which he published, with the last one published in 1990. The Jeffery CPTED model is more comprehensive than the Newman CPTED model, which limits itself to the built environment. Later models of CPTED were developed based on the Newman Model, with criminologist Tim Crowe's being the most popular. , CPTED is popularly understood to refer strictly to the Newman/Crowe type models, with the Jeffery model treated more as multi-disciplinary approach to crime