To search databases effectively you will need to understand Boolean operators. Boolean or search operators - AND, OR, and NOT, are used to link or combine separate search terms or keywords in a search statement. They allow you to combine the different elements of your search.

• Linking search terms with AND
• Linking search terms with OR
• Linking search terms with NOT

A visual representation of your search with Boolean operators would look like this:

Sample Search Strategy
Search topic: Identify common allergies that may cause asthma attacks in children
Concept A	Concept B	Concept C
allergies	acute asthma chronic asthma	children infants