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This paper aims to find the determinants of the service quality and customer loyalty concerning the police service. First, to verify hypotheses through a theoretical study, and data based on survey questions were collected from the citizens who live in Seoul or Gyeonggi-do and have previously experienced police service. The result of hypotheses verification revealed several important findings, first, it was confirmed that police service's quality components are composed of Process, Outcome, Servicescape, Societal Quality. Second, it was confirmed that service quality dimensions- Outcome, Servicescape, Societal Qualities - had effects on customer satisfaction but only Process Quality had an effect on customer trust, however Outcome, Servicescape, Societal Quality had an effect on customer trust indirectly through customer satisfaction. Third, customer satisfaction had a significant effect on customer's trust and loyalty, and customer trust had a significant effect on customer loyalty, but not customer satisfaction. Fourth, as a result of causal analysis among each hypothesized relationships, it was found that Societal Quality dimension had a significant effect on customer's satisfaction, trust, and loyalty, and this finding was able to confirm Equity and Integrity as important elements of public service. And finally, based on the findings of this study, we can develop Service Quality Index using confirmed Service dimensions of Police Service. This way, we can hope to provide more advanced quality of police service using Service Quality Index.