-Study (Khalifa, et al, 2011) entitled: "The effect of the quality of service on customer loyalty : An Empirical
Study on hotel services in Aden". The study aimed to identify the effect of service quality on customer loyalty
for hotels in the city of Aden, Yemen , after reviewing the search literature the model and the hypotheses was
building based on the theory of social exchange (Theory of Social Exchange). questionnaire was designed to
collect data, it was developed based on previous studies , , several statistical methods used such as Cronbach's
alpha and factor analysis to make sure of the reliability and stability, and to identify the impact of the dimensions
of service quality on customer loyalty has been the use of regression analysis, which showed the results of a
relationship positive between them , and based on the results of the study were presented a number of
recommendations related to quality of service and to build a strong loyalty among customers have also been
proposals for future studies .