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Abstract. Quality improvement in public service has become a major concern in government institutions in their effort to
provide the public with maximum service. It is also a major concern for Samsat (One-Roof System) institutions in Jakarta,
Bogor, Tangerang, Bekasi (Jabodetabek). The purpose of this study is to analyze the quality level of the service provided
by Mobile Samsat units in Jabodetabek. The study uses the quantitative approach in order to illustrate the gap between
consumer expectation of public service and consumer perception of the actual service, based on five dimensions: reliability,
responsiveness, assurance, empathy, and tangibility. Measurement results of the five dimensions show that customers find the
service provided by Mobile Samsat in Jabodetabek to be unsatisfactory.
Keywords: service quality, public service,one-roof system