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HLTH 235: Food Systems

Boolean Operators

Combine your keywords/search terms using Boolean Operators.

Boolean Operators (AND, OR, NOT) can improve your search results and make your searching more efficient. It's important to know that Boolean Operators are the underlying logic in library databases including Omni, article indexes and even search engines such as Google Scholar.

AND is used to:

  • Combine related/synonymous keywords. 
  • Ensure that all search terms are present in the results.
  • Narrow or refine your results.
  • For example: food security AND Canada

OR is used to:

  • Combine related/synonymous keywords.
  • Broaden your results. 
  • For example: food security or food supply

NOT is used to:

  • Exclude terms.
  • Narrow your search, telling the database to ignore concepts that may be implied by your search terms.