Often, a successful search strategy uses both keyword searching and subject searching:
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Do a keyword search to find materials on your topic.
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Examine the list of materials to locate one whose content seems to match your topic.
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Once you have this one item on the computer screen, look at the subject/descriptor field to determine which subject/descriptor heading best matches your topic.
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Do a new search for material on your topic. This time, try a subject search for the subject/descriptor heading that looked promising.
Read Word and Subject Searching to learn more about the different search strategies.