Optimized quality of IT services are those which need pre-analysis of users'' requirements, service provider''s capabilities as well as service specification and standardization. For any organization, maintaining of quality of IT service has become one of the key challenges which hold a significance importance to users'' satisfaction. Thus, this research tries to explore and identify the key factors of service quality dimensions and its affect on Information Technology Service so that organization can understand and follow the possible way to maintain quality of IT service to satisfy its end users. To achieve ultimate target of this research, the relevant three literatures have been reviewed and then the concept structure has been proposed for the analysis. A qualitative research approach has been used to get a better understanding of the issue. This study is expected to create a significant contribution to the areas within a domain of service quality in Information Technology as well as in Information System and Information Management.