## 5 Discussion  
This study has identified the intelligent CPTED concept that combines CPTED and crime prevention technologies and set forth the evaluation model to support decision-making in crime prevention. CPTED is a spatial urban design technique intended for crime prevention, while crime prevention technologies work as a tool that can monitor abnormal situations with hardware equipment and software solutions, including CCTV systems and IoT. In this regard, CPTED and crime prevention technologies are making progress as different means of preventing crimes, and it is important to discuss why intelligent CPTED systems combining both of them is necessary. Various factors are at play and lead to a crime in complex ways. The broken windows theory, which is often cited as an example of CPTED, states that a single broken window left unattended leads to a gradual spread of crimes around that location. Orderly conditions must be created and maintained in terms of facilities, environments, and spaces because trivial disorder may lead to a bigger crime, as suggested by the broken windows theory. Although this urban design approach is effective in preventing crime to some extent, its limitation is that it is difficult to respond to a crime after it occurs. One of the advantages associated with using systematic crime prevention technologies, such as CCTV systems, IoT, and platforms, is that they can respond to crimes across the cycle, from CPTED prevention to real-time response to post-crime handling, including victim protection and suspect arrest. Of course, just like the effect of CPTED, crime prevention technologies work as a powerful means of suppressing  
Figure 3: Comparison graph of results between AHP and fuzzy TOPSIS. impulses to commit a crime. The intelligent CPTED service elements with a strong tendency toward CPTED in this study include the intelligent pedestrian environment system and smart safety community. The evaluators in this study were decision-makers in municipal control centers; consequently, they acted more as service providers. In this regard, control elements, such as CCTV systems and the crime monitoring system, ranked higher, while CPTED elements, such as the intelligent pedestrian environment system (5 th) and the smart safety community (10 th), ranked somewhat lower. Awareness must be raised about the importance and value of the CPTED systems that are closer to residents and support safety in everyday life, and a follow-up study would be needed, considering the characteristics of low-rise residential areas in Korea. Considering where the respondents lived, this study categorized them into large cities in the Seoul metropolitan area and small and medium-sized cities in other provinces. In Korea, Seoul is a megacity, in which the country's urbanization is concentrated. Hence, the country is characterized by stark differences in terms of scale and crime prevention infrastructure between large cities in the Seoul metropolitan area and small and medium-sized cities in other provinces. In large cities in the Seoul metropolitan area, platform services, such as the crime monitoring system, the mobile crime prevention app, and real-time control drones/robots, were evaluated relatively higher. This is because there is a huge need for maximized crime prevention and response services, which apply system services for control based on advanced crime prevention infrastructure. In addition, smart safety community services, which ease fear about crimes due to high population density and support safety in everyday life, were also ranked higher than in small and medium-sized cities in other countries. By contrast, the crime prevention services that could be felt by residents and improve crime-prone environments, such as AI video analysis for living safety, smart street lights, and the improved parking environment system, were evaluated higher in small and medium-sized cities in other provinces.