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Bruhn (2013) lists seven commonly used models of different authors that all try to sum up results of the rather subjective perceptions of service delivery in a measurable and tangible way, to which service managers are able to implement suitable solutions.
Based on the five dimensions of service, so called “RATER” (see Figure 2), Parasuraman, Berry, and Zeithaml already identified in 1988 that measuring quality of goods differs from measuring quality of services and developed the SERVQUAL model (see Figure 3), which is still being used in many service based sector such as financial institutes or hospitality. The SERVQUAL model seeks to identify the following five gaps between the expected and the experienced service quality from the customer’s as well as the management’s perspective to be able to close them:
Gap 1: Mismatch of management perception and customer expectation
Gap 2: Missing communication between management and service