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Due to impact of Information and Communication Technology (ICT) and changing needs of users, libraries have to force to shift from manual to automated environment. Users now want quality services within shortest possible time. Libraries have to assess its services from the user’s point of view. It is the user, who can judge the services better provided by the concerned library. In this paper, it is try to review the available literature on assessment of service quality of libraries worldwide. The present study would be beneficial for library professionals, research scholars and the teachers of library and information science, who want to do further research work on the aspect of service quality of libraries.