This is a form of algebra where variables are truth values, rather than numbers. It was named after, and invented by, George Boole, an English mathematician in the 17th century. It combines concepts by conjunction (AND), disjunction (OR), or negation (NOT).
You will use Boolean operators to combine search terms in meaningful ways. Terms in one concept will combine with OR. Combine with AND across concepts.
Example: hand sanitiz* OR handwashing OR hand w/5 scrubbing
Example: (hand sanitiz* OR handwashing OR hand w/5 scrubbing) AND (cross infection OR "hospital acquired infection")
All databases use Boolean operators in the same way.
The Published International Literature on Traumatic Stress (PILOTS) Database is an electronic index to the worldwide literature on PTSD and other mental health consequences of exposure to traumatic events. Unlike other databases, the PILOTS Database does not restrict its coverage to articles appearing in selected journals. It attempts to include all publications relevant to PTSD and other forms of traumatic stress, whatever their origin without disciplinary, linguistic, or geographic limitations.
Steps in the literature search proces: