It's important that you spend some time planning and developing an effective search strategy to make sure you find relevant literature efficiently.
You will need to:
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Determine the key concepts of your topic to identify your main search terms
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Establish your inclusion and exclusion criteria - what aspects of your topic are you focusing on?
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Find related search terms to broaden and/or focus your search
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Decide which resources you are going to search.
Planning, managing the information you find, note-taking and reflecting on your progress as you go, will save you time later on in the process.