Create a Search Strategy
Connectors
Connectors (Boolean operators) are used in keyword
searches to link together two or more terms. The most
commonly-used connectors are:     
AND and OR.
AND narrows a search; you get
fewer records, because
both
concepts must be present in the
records found--here the area in
blue. Use
AND to combine
different concepts in one search.
OR broadens a search; you get more
records because
OR includes each of the
concepts separately, as well as both
concepts when found together.
OR is often
used to link together related concepts
.
computer AND history AND
mathematics
computer OR history OR
mathematics
Click this link for a demonstration of how Boolean operators work:   
http://kathyschrock.net/rbs3k/boolean/
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