![]() The Boolean OR lets a search be conducted for either or both of the keywords used in a search. If too few or no references are found, a broader search can be done by using only two or three keywords at a time. This search will find results that reference adolescents, PTSD, treatment, foster care, and abuse in the article. Then, you may want to narrow your search a little: adolescents AND: PTSD Your first search may be: adolescents AND: PTSD You are interested in finding the appropriate treatment for a teenager who is living in foster care and has PTSD due to previous child abuse. AND can be used more than once in a search string for example: depression AND children AND prevalence AND poverty. They are capitalized here in order to highlight the concepts.įor example, if searching for articles on depression AND children, the database will pull up articles that contain both the words depression and children. Most of the time, AND, OR, and NOT do not need to be capitalized in the search. NOT-Use to exclude a term from the search.OR-Use when searching for documents that contain one of the terms that OR separates.AND-Use when searching for documents containing both words that AND separates.Boolean techniques include using the words AND, OR, and NOT in combination and with a variety of other techniques to achieve and find results. Using the Boolean method, searches for research information can be simple or complex depending on the type of information and the detail desired. ![]() Now, his method is used for most database inquiries. The Boolean method of searching began with George Boole (1815–1864), a mathematician who created the method for symbolic logic. Many search resources utilize a Boolean method for searching. ![]()
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