Basic Information Sifting - Phrase, AND, NOT

Whether using a search engine or a structured database, the wealth of information on most topics requires that the results be refined or sifted or limited to produce highly relevant responses. One of the best summaries of common techniques was developed by the metasearch engine Ixquick:

http://ixquick.com/eng/aboutixquick/about_hints_improve.html

When I teach students how to use information resources, I cover three basic techniques for refining a textual search for information to sift-out irrelevant material:

1. Sometimes, the concept you are seeking information on is always expressed as a phrase. In that case, enclose the sought phrase in quotations marks when you place it in the text search box. [example: "North America"] However, this technique can miss finding a lot of material if there is any way to express the search differently - for example, if you apply a phrase search for "boxer dog" to a text that reads: "My favorite dog is the boxer. The boxer is the best breed of dog for a homeowner, because it is courageous, devoted, intelligent, and has the physical presence to defend the home. The boxer is a dog with many admirers...." The search for the phrase "boxer dog" will not find the phrase anywhere in the sample text, so this relevant document would not be retrieved.
2. Often, the sought concept has one or more words associated with it - for example, if you are looking for the dog called the boxer. If you just type the word boxer in the search box, references to shorts, Senator Boxer, and the Boxer Rebellion may be retrieved. If the search is modified, limited to documents where both the words "boxer" and "dog" occur in the text, most of the irrelevant results should disappear. To insist that both words be present in a document, either use the Boolean method of linking terms with the word "AND" [example: boxer AND dog] or precede each required term with a "plus sign" [example: +boxer +dog]. Note that some electronic catalogs and journal databases, such as EBSCOHost, require the Boolean methods be used for keyword searching, so preceding required terms with a plus sign should be limited to "free" tools like Google or AskJeeves.
3. Another way to refine a search strategy is to indicate that you do not want results that include specified irrelevant terms. The Boolean method is to use the word "NOT" [example: boxer NOT senator] preceeding the word that is to be barred from the results, or the minus sign may be used to preceed the unwanted term [example: boxer -senator].

_-DD