what they want, and what they value.
In recent decades, scientists found that the quality of services has a significant influence on customer satisfaction and customer loyalty. There are many suggested models for Service Quality measurement but in this study, we focus on four particular
models, which are most common in marketing researches and are the basis of other models. Reviewing
these models shows that all of them have some advantages and disadvantages and Service quality
models have improved day by day. In this study, we found the Hierarchical model as the comprehensive
model. This model contains significant factors and works by researchers approving the validity and
reliability of this model in different categories. It is an applicable service quality measurement for
marketing managers.