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When a researcher decides to conduct research, it requires the advantage of the research that has been accumulated in the past. Any research cannot be conducted in isolation without the knowledge of work done on the problems directly or indirectly related to the study proposed by the researcher. A careful review of literature, including books, theses, research journals, and other informative documents related to the problem that must be investigated by the researcher is an important step in planning and research. A careful review of research documents on the problem to be investigated is one of the important steps in planning any research as a quality review of related literature precedes any well-planned study.
