A qualitative summary of the evidence on a general topic or specific question using informal or subjective methods to collect and interpret studies.
A literature review helps the author:
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Understand the scope, history, and present state of knowledge of a specific topic
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Understand application of research concepts such as statistical tests and methodological choices
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Create a research project that complements the existing research or fills in gaps
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Identify sources of information or data that might be useful to you
A literature review helps the reader:
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Understand how your research project fits into the existing knowledge and research in a field
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Understand that a topic is important/relevant to the world
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Evaluate the state of research on the topic.