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Kalamazoo College
(c)CMcGuireKSpr2011_0190

Boolean logic is the bedrock of searching. It uses AND, OR, and NOT to tie concepts together when you search in databases, indexes, or the Web. When used in this way, AND, OR, and NOT are called Boolean Operators. They can broaden or narrow your search.

TERM STATEMENT WHAT IT DOES EXAMPLES
(shaded areas indicate retrieval)
AND cats AND dogs searches for documents that discuss both cats and dogs AND_venn
OR cats OR dogs searches for documents that discuss either cats or dogs OR_venn
NOT cats NOT dogs searches for documents that discuss cats but not dogs NOT_venn

Helpful explanation of Boolean Logic: