Now that you have developed a well-built question and developed search terms, it is time to search for evidence. Primary evidence presents the detailed findings or results from an original research project, observation, or experiment. In searching, use the Publication Type (Article Type) limits or filters in databases to locate the following types of primary evidence:
Secondary evidence is synthesized or summarized findings from one or more studies. Use the Publication Type (Article Type) limits or filters in databases to locate the following types of secondary evidence:
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CFCF, CC BY-SA 4.0 <https://creativecommons.org/licenses/by-sa/4.0>, via Wikimedia Commons
*You would never want to randomize someone to a known harm.
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