Using Boolean Operators 2/26/2019 Using Boolean Operators AND, OR, NOT, Parenthesis, NEAR 2/26/2019 Straughn High School

Boolean Operator AND If you enter AND between two words then your search will only yield documents that contain both words, narrowing your search. If you enter goldfish AND guppies then your search will yield only documents with both words. 2/26/2019 Straughn High School

Boolean Operator OR If you enter OR between two words then your search will look for either word (you don’t care which word), broadening your search. If you type in goldfish OR guppies in your search engine then your search will yield documents that contain the word goldfish or the word guppies. 2/26/2019 Straughn High School

Boolean Operator NOT NOT tells the search engine to disregard those documents that contain a word. This is a powerful command and should be used sparingly. 2/26/2019 Straughn High School

Why not Not? If you search goldfish and guppy and get lots of information about swordtails, you might be tempted to try NOT swordtails. But what if the best authority on goldfish is an authority on swordtails, too? What if her name is Irma Swordtail? You could miss lots of information. 2/26/2019

Boolean Operator Parenthesis ( ) Search engines do not read left to right. Most interpret the AND first, then follow with the OR. You can tell the search engine to interpret the OR first by typing (goldfish OR guppies) AND food . Don’t use ( ) when you’re only using AND. 2/26/2019

Boolean Operator NEAR Narrow a search by using the term NEAR to retrieve only documents where the searched words appear close together. If you search for information on gray cats, and you type gray AND cats, documents describing cats that lived in gray houses, or slept on gray mats, or woke up and the day was gray might appear on the list. 2/26/2019 Straughn High School

Now give it a try! Each search engine has different rules about upper and lower case letters and the use of Boolean operators. Check their directions. Try some experimental searches. Browse the results and make any necessary adjustments to the structure of your search words and operators. With a little practice, you can save hours of time in cyberspace and focus on the task at hand! 2/26/2019 Straughn High School

Venn Diagrams In your notes, create a set of Venn Diagrams depicting the results for the following searches: OR fruit OR vegetables fruit OR vegetables OR cereals AND rivers AND salinity dairy products AND export AND europe 2/26/2019

Venn Diagrams NOT Parentheses fruit NOT apples (foxes OR rabbits) AND pest control foxes OR rabbits AND pest control 2/26/2019

http://www.mountsaintvincent.edu/library2/venn.htm 2/26/2019