1 / 22

Contents

Contents. Boolean Logic Truncation Phrase Searching. the THEORY. Boolean Logic. Boolean logic allows users to combine search terms. Boolean logic allows users to both expand or limit their search. the THEORY. Boolean Logic.

poppy
Download Presentation

Contents

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Contents • Boolean Logic • Truncation • Phrase Searching

  2. the THEORY Boolean Logic • Boolean logic allows users to combine search terms. • Boolean logic allows users to both expand or limit their search.

  3. the THEORY Boolean Logic • This is achieved by using Boolean operators AND, OR andNOT to link the search terms in searches. • Boolean logic is used by search engines on the Internet and some CD ROMs.

  4. the THEORY Boolean Logic • An example will explain how the operators (or link words) work to limit or expand your search. • The question for this search is: How are children affected by television?

  5. the THEORY Boolean Logic • First it is necessary to isolate the major terms from the example to use as search terms. • These terms are referred to as key words. • E.g. The keywords from this example are CHILDRENandTELEVISION.

  6. the THEORY Boolean Logic • The first operator (or link word) to investigate is OR • How will it affect the search on children and television? • Will the search expand or will OR limit the search?

  7. Using OR Boolean Logic • Type in“children OR television” • Documents retrieved have either of the key words on them. OR Highest retrieval Television & children

  8. Using AND Boolean Logic • The second operator (or link word) to investigate is AND • How will it affect the search onCHILDRENandTELEVISION

  9. AND narrows the search Using AND Boolean Logic • Type in “children AND television” • Items retrieved only where childrenand television both appear on the pages. Television &children

  10. Using NOT Boolean Logic • The third operator (or link word) to investigate is NOT • How will it affect the search onCHILDRENandTELEVISION?

  11. Not Pages contain one but not the other term Using NOT Boolean Logic • Type in “television NOT children” • Items retrieved refer to television only. Items on television

  12. Using ALTA VISTA Boolean Logic • Search engines require users to click on advanced search to use boolean searching. • Individual engines use boolean slightly differently. • The example of how Alta Vista uses boolean logic will explain further.

  13. Using ALTA VISTA Boolean Logic • Boolean searching with search engine Alta Vista requires the + (plus) symbol to be placed before all terms if they are to be included. (+ replaces AND) • E.g. +china +plate will result in both terms being somewhere in all documents retrieved. Try it : http://www.altavista.com/

  14. Using ALTA VISTA Boolean Logic • Boolean search with Alta Vista requires the – (minus) symbol to be placed before terms which are to be excluded. (- replaces NOT) • E.g. china –plates retrieves all documents with China but excludes documents containing plates. Try it : http://www.altavista.com/

  15. Using ALTA VISTA Truncation • Truncation is a tool which can broaden a search. • Users enter part of a word in order to ensure retrieval of all documents containing variations of the word. • Try the next examples using Alta Vista.

  16. Using ALTA VISTA Truncation • Tool to broaden searches • Right hand truncation with* • Type sight* • You will retrieve documents with sights, sightseeing, sighted etc. Try it:http://www.altavista.com/

  17. Using ALTA VISTA Truncation • Internal “wild-card” truncation with* • Type colo*r • You will retrieve documents containing both colour and color. • Try it:http://www.altavista.com/

  18. Using GOOGLE Phrase Searching • Phrase searching offers another tool which will contribute to a successful search on the Internet. • Try the following examples -

  19. Using GOOGLE Phrase Searching • Enclose terms to be searched as a phrase in quotes “children’s book week” “The capital city of India” • The phrase will be retrieved exactly as keyed in. Try it: http://www.google.com/

  20. Tyner, R. (1999). Internet Search Tools & Techniques. M.L.S.Okanagan University College. Available from http://www.sci.ouc.bc.ca/libr/connect96/search.htm References • Henninger, M. (1999). Don’t Just Surf. Effective research strategies for the net. University of New South Wales Press Ltd., Sydney. Barlow, L.(1996-1999). The Spider’s Apprentice: A Helpful Guide to Search Engines. Monash Information Services. Available from: http://www.monash.com/spidap4.html

  21. Created & Designed by Syba Signs P/L www.sybasigns.com.au C 2001 Syba Signs

More Related