This model has the advantage of covering all aspects of the service, however, all 10 components of the complex servqual difficult during the analysis and evaluation. So, Parasuraman and colleagues (1988) have recalibrated and forming new model includes 5 basic ingredients (Nguyen Dinh Tho, 2007)
Inherit Parasuraman et al's theory (1988), Johnston and Silvestro ( 1990) also summarized five other factors of quality of service including:
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