Research by Parasuraman (1985) for that service quality is the gap between the expectation of the customer about the services they are used to sense the fact about the services they enjoy. The researchers introduced the 5 model of service quality gap. The questions are designed to measure these concepts in the 5 factors in the model. Measure each concept 2 aspects: aspect the Berry waited about service quality and on aspects of service that they actually receive. Therefore, when the expected quality is larger than the true quality, quality of service is calculated to be low.
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