Why is a review of literature necessary before conducting research, and what are the key sources for literature review?

A review of literature is an essential foundational step in any research project, particularly in the context of development communication. This systematic examination of previous research and existing knowledge not only provides a context for the study but also helps in framing research questions, identifying gaps, refining objectives, and ensuring that the research builds upon a solid scholarly foundation. In the domain of development communication, where the aim is often to influence social change through communication strategies, policies, and practices, a literature review becomes even more critical. It enables researchers to assess the effectiveness of past communication interventions, understand theoretical and methodological orientations, and align their study with current discourses.

The primary reason a literature review is necessary before conducting research is that it establishes the theoretical and empirical framework of the study. It guides the researcher in understanding what has already been studied, what methods have been used, and what conclusions have been drawn. This, in turn, helps in avoiding duplication of efforts and allows the researcher to position their study meaningfully within the existing body of knowledge. For example, in development communication, a researcher studying the impact of radio-based health communication in rural areas needs to be aware of previous ___ _____ ______ ______ _________ _________ _______.
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