Although many have suggested different approaches, as well as adjustments in the above approach, the research efforts have recently focused on the value of both academic research model quality basic services. American model developed by Parasuraman et al (1985) is the first model. Dubbed "SERVQUAL", this model applies the frame spacing, suggest that the gap between service quality expectations and is perceived decided to evaluate the quality of customer service strategies. Although initially there are ten factors to be considered, but the extensive study conducted in 1988 found that many closely related between a number of factors should have the collapse of ten factors to also five factors is the reliability (reliability), responsiveness (responsiveness), empathy (empathy), the guarantee (assurance) and visible (tangibles).
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