「都市公共空間犯罪預防理論」是探討公共空間的犯罪預防理論，並以減少機會為研究途徑的理論。這一理論將現有主流的犯罪預防理論進行整合，並利用實證研究釐清在都市公共空間中的犯罪預防的要點及因子為何。本研究的理論推導過程分為三階段，即第一階段的相關犯罪預防理論之整合；第二階段則透過實證研究產生理論的普遍性原則；第三階段則將普遍性原則發展成理論的核心概念。

理論的前提共有兩項，即為所有犯罪者必須是理性的行為個體，且是會受到環境因素的影響；以及所有有動機的犯罪者是否決定犯案，實與當時的情境是否提供充分的機會有關。與此同時，理論亦舉出兩項預防要點，即（1）有效的監護者，以及（2）物質建成環境。在這兩項要點之下，發展出三項的環境要點，即（1）街道與建築的緊密結合；（2）控制點與監控；（3）建築的監護者角色。

透過實證研究及普遍性原則之探索，研究發展出理論的四個核心概念。首先為可辨識性，公共空間如能辨識其空間功能及屬性，有助於預防犯罪的發生；第二為完整性，公共空間的完整性，如延續性、整齊性及堅固性，能加強犯罪預防的能力；第三為隱蔽性，公共空間如能提供空間使用者的隱蔽性空間，能降低被傷害的機會；最後則為透視性，公共空間必須具透視性，以為環境提供安全的視線。

Urban public space crime prevention theory focuses on opportunity reduction approach rather on criminal or victim. The process in this research is divided into three phases. First, is combining the major relevant theories into one through literature review. And the second phase develops the general principles of crime in public space through empirical studies. And the last, is structuring the core concepts of the theory.
This theory has two basic assumptions. The first is all the criminal should be (ought to be) rational, and their illegal behaviour and action will be influenced by surrounding environment. The second is the potential criminal decides to commit a crime or not depended on the situation at the moment is providing the opportunity or not.

This theory also develops two crime prevention elements, which are “efficiency guardian” and “the physical built environment”. On the other hand, there have three environmental elements in this theory, which are (1)the closer relationship between street and building; (2)the control point; (3)building can be a guardian for crime prevention.

Through the empirical studies and the process of generalization, this theory has further developed four core concepts that help to develop crime prevention environment in public space, which are identifiable, completeness, concealable and visible.

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