After selecting your broad topic you will need to choose keywords to help narrow your search.
Keywords are also important to guide your searching in the library databases.
One keyword may be too few, more than four keywords can be too many. Two to four keywords will be a better amount.
IMPORTANT: Identifying the key concepts of your topic will provide a better focus for what exactly you are looking.
The video below explains how to pick keywords. (Skip any beginning ad/commercials.)
--from Krueger Library - Winona State University