3. METHODOLOGY
In this study, we used literature research method for finding the best model in service quality
measurement. One of the useful methods (especially in review works) is literature survey. Using
secondary sources and work of other researchers is base of this study. This paper critically reviews and
discusses four different service quality models reported in literature. Objective of this study is finding
the best and comprehensive model in measuring customer perception about quality of services for
different industries. in the next section we are going to discuss about four models of service quality and
finding of researchers about these four measurement