Tara Guthrie, 2010 BOOLEAN SEARCHING How it can help you do effective database and Internet searching.

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Presentation transcript:

Tara Guthrie, 2010 BOOLEAN SEARCHING How it can help you do effective database and Internet searching

Tara Guthrie, 2010 What is Boolean searching? It is based on a method of logic developed by George Boole, a 19 th century English mathematician. Most online databases and Internet search engines support Boolean searches. It allows you to do effective searches by cutting out many unrelated documents.

Tara Guthrie, 2010 Basic Boolean Operators: AND OR NOT

Tara Guthrie, 2010 AND Using AND narrows your search. It retrieves documents that contain both of the search terms or keywords that you specify. The more terms you connect with AND, the fewer search results you will find.

Tara Guthrie, 2010 Example Using AND: Poverty AND Crime Documents are retrieved containing both search terms. Blue shaded area represents search results.

Tara Guthrie, 2010 OR Using OR broadens your search. It retrieves documents that contain either of the search terms or keywords that you specify, but not necessarily both. The more terms you connect with OR, the more search results you will find. (Remember: OR gives you more!) Use it to search for similar terms.

Tara Guthrie, 2010 Example Using OR: College OR UniversityCollege OR University Documents are retrieved containing either search term. Gold shaded area represents search results.

Tara Guthrie, 2010 NOT Using NOT narrows your search. It retrieves documents that do not contain a search term in your search. Use NOT to exclude a term from your search and to find fewer results.

Tara Guthrie, 2010 Example Using NOT: Cats NOT Dogs Documents are retrieved containing only information on cats, and nothing on dogs. Purple shaded area represents search results.

Tara Guthrie, 2010 Advanced Boolean Search Techniques “Quotation Marks” (Parentheses)

Tara Guthrie, 2010 “Quotation Marks” Using quotation marks narrows your search. It requires words to be searched as a phrase in the exact order that you type them within the quotation marks. Helpful for searching multiple-word terms, places, or a person’s name.

Tara Guthrie, 2010 Examples Using “ ” “global warming” “New York City” “Brad Pitt” Note: Using “quotation marks” will give you different search results than if you use the AND operator between each word without quotes.

Tara Guthrie, 2010 (Parentheses) (Parentheses) allow you to combine any of the Boolean operators together in combination. Use NOT and OR together to limit your search. Use AND and OR together to expand your search. Using ( ) allows you to combine two possible searches into one, and it saves you time.

Tara Guthrie, 2010 Example #1 Using ( ) “alternative energy” NOT (wind OR solar) Using this search string would allow you to find documents about alternative energy, but not wind or solar methods – it would only give you other methods. Your search is narrowed by using NOT, and you exclude more by using OR. How could this be divided into 2 searches?

Tara Guthrie, 2010 Example #2 Using ( ) “peanut butter” and (salmonella OR “food poisoning”) Using this search string allows you to find anything about peanut butter as it relates to salmonella or food poisoning. Salmonella and food poisoning are two related terms. So combining them in ( ) with OR helps us find more info. How could this be divided into 2 searches?

Tara Guthrie, 2010 How do I know which Boolean Operators to use? AND OR NOT “ ” ( )

Tara Guthrie, 2010 Sample Question #1 I want to find information about cloning humans. You may want to try a couple of search strings for more varied results. Possible searches: –cloning AND human –“human cloning”

Tara Guthrie, 2010 Sample Question #2 I want to find information about either Brad Pitt or his wife, Angelina Jolie. Suggested search: –“Brad Pitt” OR “Angelina Jolie”

Tara Guthrie, 2010 Sample Question #3 I want to find information about mummies, but not mummies in Egypt. Suggested search: –mummies NOT Egypt

Tara Guthrie, 2010 Sample Question #4 I want to find information about behavior in cats. Consider: is there more than one term used for a cat? Possible search: –behavior AND (cats OR felines)

Tara Guthrie, 2010 Sample Question #5 I want information on designing web sites, but not on specific web design software programs. Consider: which software programs help you create web sites? Possible searches: –“web site design” NOT (Dreamweaver OR “Front Page”) –“web site design” NOT software

Tara Guthrie, 2010 Boolean Search Tips If you find too many search results, you may need to narrow your search. Revise your search by adding additional terms using AND, or excluding a term using NOT. If you do not find enough search results, you may need to expand your search. Try using synonyms for your search term using OR.

Tara Guthrie, 2010 Boolean Search Tips You may need to try searching for your search terms in several different ways to find different results. If you are still having problems finding what you need, consider these questions: –Is my topic too broad? –Is my topic too specific? –What are some other search terms I can use? –How can I search these terms differently?

Tara Guthrie, 2010 Remember: Your friendly library staff is here to help if you need further assistance!

Tara Guthrie, 2010 Happy Searching!