Service exists in the service provider and the service receiver. They can produce the contractual relationship which is value and trust mutually. People can obtain the different intension of service with different knowledge background and technique. In this paper, service is recognized in the views of 12 levels. Through the description and analysis of these 12 levels, the method for existing services is summarized. Thereby the important impact on service science is elaborated in the modern economy.
C. H. Lovelock, “Classifying Services to Gain Strategic Marketing Insight: The Diversity of Service Sector Makes It Difficult to Come up with Managerially Useful Generalizations Concerning Marketing Practice in Service Organizations,” Journal of Marketing, Vol. 47, No. 3, 1983, pp. 9-20. doi:10.2307/1251193