For service quality evaluation of it more difficult because the service other than tangible products. The theory of marketing services for that service includes three basic characteristics is heterogeneous, intangible and cannot be segregated.Firstly, the majority of the services are considered intangible products. Service weight, swung, measuring, counting, testing or inspection before purchase, to check the quality. With the invisible reason, should the company feels very difficult in understanding customer perceptions about the service and quality assessment services.Second, heterogeneous services, especially for those services have high concentrations of human labour power. The reason is the operation of common services change from service providers, from customers, and the quality of service provided is also not the same each day, month and year of business. The uniform quality required from staff members will also be very difficult to ensure. What is the reason that the company intends to serve, you can completely different from what the customer receives.Third, production and consumption for various types of service are inseparable. The quality of service cannot be produced in the plant, and then move the status quo of service to customers. For these services have high labor content, the quality of service in the process of interaction between the customers and employees of the company providing the service.Because of these characteristics on the issue, assess the quality of services is not a matter of simple and easy to make. For a long time, many researchers have tried to define and measure the quality of service. For example, Lehtinen & Lehtinen for is the quality of service must be judged on two aspects, (1) the process of providing the service and (2) the results of the service. Gronroos also suggested two areas of service quality, which is (1) the technical quality and (2) the functional quality. Technical quality is related to what is served and the quality of the functions they are talking up how the service
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