en و موضوعات مربوط Other Related Subject پژوهشي Research <p> <i> Response time is one of the critical web service quality dimensions. It refers to how long it takes that a web service responds to request of a user. In order to manage the response time, pricing schemes can work as an efficient access control mechanism. In this paper, we study competition between two providers offering functionally same web services where there is a monopoly service provider. The monopoly offers a service that is complementary to their services. Each provider needs to decide a service level (L or H) and a corresponding price for the selected service level to meet the service level guarantee. We construct a Stackelberg game and benefit from queuing theory concept to propose a model that can examine strategic choices of the providers . </i></p> Web Service Providers, Pricing, Game theory, Queuing theory, Competition, Complimentarity 181 195 http://ijiepr.iust.ac.ir/browse.php?a_code=A-10-95-5&slc_lang=en&sid=1 Ali Habibi Badrabadi alihabibi@sina.kntu.ac.ir 18003194753284600829 18003194753284600829 No A. Habibi Badrabadi, Postgraduate Student, IT Group, Industrial Engineering Department, K.N. Toosi University of Technology Tehran, Iran Mohammad Jafar Tarokh mjtarokh@kntu.ac.ir 18003194753284600830 18003194753284600830 Yes Ph.D., Associate Professor ,IT Group, Industrial Engineering Department, K.N. Toosi University of Technology Tehran, Iran