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Research Success for High School Students


Boolean operators are used to combine concepts or ideas when searching. The three Boolean operators you will use in searching are AND, OR, and occasionally NOT. The operator you select will determine if the number of results you retrieve is increased or decreased. In most searches, you will use a combination of these operators in order to narrow or broaden your results as needed.


Use AND in between words in a search to:

  • narrow your results
  • tell the database that you want ALL search terms included in the results


Searches for cats AND dogs will retrieve articles that contain both the word "cats" and the word "dogs." If an article only contains the word "cats" but not the word "dogs", that article will not be retrieved.



Use OR in a search to:

  • broaden your results
  • tell the database that you want EITHER search term in your result
  • connect two or more similar concepts (synonyms)


Searches for cats OR dogs will retrieve all the articles that contain the word "cats", the word "dogs", or both. You can also add more search terms into the mix, with the understanding that this will further expand your search.



Use NOT in a search to:

  • narrow your search
  • exclude words from your search
  • tell the database to ignore certain things that may be related to your search terms


Searches for cats NOT dogs will retrieve all the articles that contain the word "cats", but excludes from that list anything that uses the word "dogs." You have to be very careful when using this operator, as it will severely restrict your results and you may miss something important. An example of when to use NOT might be when you're looking for articles about dolphins (the animal) and you keep getting results with Dolphins (the Miami football team) You could do a search like, dolphins NOT football.


The ASU Library acknowledges the twenty-three Native Nations that have inhabited this land for centuries. Arizona State University's four campuses are located in the Salt River Valley on ancestral territories of Indigenous peoples, including the Akimel O’odham (Pima) and Pee Posh (Maricopa) Indian Communities, whose care and keeping of these lands allows us to be here today. ASU Library acknowledges the sovereignty of these nations and seeks to foster an environment of success and possibility for Native American students and patrons. We are advocates for the incorporation of Indigenous knowledge systems and research methodologies within contemporary library practice. ASU Library welcomes members of the Akimel O’odham and Pee Posh, and all Native nations to the Library.