Service Engineering is a new engineering idea which aims at increasing service and knowledge contents of added values generated in product life cycle. This report focuses on a service modeling method which is needed in the first step of the Service Engineering. Firstly, we clarify why service should be discussed and argue that intensifying service contents is crucial not only for arriving at environmentally conscious design and manufacturing but also for creating more added values in future advanced societies. Secondly, we present essential concepts of service engineering that is required to intensify service contents. Furthermore, we discuss about subjectivity of service. In general, service is related not only to objective elements but also to the receivers' perception of service contents. In this context, we propose a service modeling method which can represent services with such subjective property of service by clarifying actual service cases.
