The process of studying different article, book, journals and different sources of information to gather knowledge of selected topic under study is known as review of literature. It is the preliminary stage of any research after selecting a research problem. It is a abstract of previous research on a specified topic on which researcher provides the description, summary and critical evaluation of each sources of knowledge. It gives idea about how variables are related in past studies and what difficulties previous researcher faced, so that you can take care on those points. It helps to distinguish the new research with previous researches. It enables the researcher to conduct research in an effective way. The existing literature should be to identify the following issues:
1. What is already known about this area?
2. What concepts and theories are relevant to this area?
3. Are there any significant controversies?
4. Are there any unanswered research questions in this area?
5. Are there any inconsistencies in findings relating to this area?
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