Search strategies


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Search strategies

  1. 1. An Introduction To P OWERSEARCHING ON THE WORLD WIDE WEB Curriculum Services Associates
  2. 2. W orld W ide W eb at a glance! <ul><li>Internet – a collection of tens of thousands of computer networks that exchange information according to some agreed-upon, uniform rules or protocols. </li></ul><ul><li>WWW . – a large collection of information accessible through the Internet. </li></ul><ul><li>To use the Internet and WWW effectively one needs to know how to find and use the services, tools, and programs to access resources and information. </li></ul>
  3. 3. Using the WWW for Research <ul><li>Directories </li></ul><ul><li>Search Engines </li></ul><ul><li>Meta-Search Tools </li></ul><ul><li>Virtual Libraries </li></ul><ul><li>Specialized Databases </li></ul><ul><li>FTP Archives </li></ul><ul><li>Email Discussion Groups </li></ul><ul><li>Usenet Groups </li></ul>
  4. 4. Directories <ul><li>A general collection of Internet and WWW resources, arranged by subject </li></ul><ul><li>Created and maintained by people </li></ul><ul><li>Browse by subject or search by keyword. </li></ul><ul><li>Generally support search features. </li></ul>
  5. 5. Search Engines <ul><li>Most powerful tool on the WWW. </li></ul><ul><li>Created and maintained by computer programs. </li></ul><ul><li>Index the entire text of each document. </li></ul><ul><li>Support Search Features </li></ul><ul><ul><li>Boolean Operators </li></ul></ul><ul><ul><li>Phrase Searching </li></ul></ul><ul><ul><li>Proximity Searching </li></ul></ul><ul><ul><li>Truncation </li></ul></ul><ul><ul><li>Wildcards </li></ul></ul><ul><ul><li>Field Searching </li></ul></ul><ul><ul><li>Case Sensitivity </li></ul></ul><ul><ul><li>Concept Searching </li></ul></ul><ul><ul><li>Limiting by Date </li></ul></ul>
  6. 6. Meta-Search Tools <ul><li>Allows the user to use several search engines at once. </li></ul><ul><li>Parallel search tools allow user to search several sites simultaneously. </li></ul><ul><li>All in one search tools list WWW sites along with search formats so user can search one at a time. </li></ul><ul><li>Major drawback – individual databases are not used to their fullest capabilities. </li></ul>
  7. 7. Virtual Libraries <ul><li>Directories or subject catalogs consisting of selected Web resources. </li></ul><ul><li>Knowledgeable people choose the sites. </li></ul><ul><li>High probability of finding relevant resources. </li></ul><ul><li>Classroom teacher can feel are students relatively safe because sites are carefully selected. </li></ul>
  8. 8. Specialized Databases <ul><li>Contains comprehensive collections of hyperlinks in a particular subject area. </li></ul><ul><li>May be self-contained searchable indexes made available on the WWW. </li></ul><ul><li>Provides user with reliable up-to-date information while saving time. </li></ul><ul><li>Supports Search Features. </li></ul>
  9. 9. FTP Archives <ul><li>Collections of files in various formats available on the Web. </li></ul><ul><li>Publicly available through FTP Archives. </li></ul><ul><li>Many FTP files are shareware or freeware and may be used and distributed at no cost. </li></ul>
  10. 10. E-mail Discussion Groups <ul><li>E-mail is most popular use of the Internet. </li></ul><ul><li>People with common interests form groups. </li></ul><ul><li>Interest Groups, Mailing Lists, or Listservs based on a specific topic. </li></ul>
  11. 11. Usenet Newsgroups <ul><li>Collections of groups discussions, questions, answers, and other information that have been shared through the Internet. </li></ul>
  12. 12. 10 Steps to a Successful Search <ul><li>Identify important concepts of search. </li></ul><ul><li>Carefully choose keywords. </li></ul><ul><li>Determine other variations of keywords. </li></ul><ul><li>Determine which search features may apply. </li></ul><ul><li>Choose a search engine </li></ul><ul><li>Identify search instructions on search engine’s home page. </li></ul><ul><li>Create a search expression appropriate for the search engine. </li></ul><ul><li>Evaluate the results. </li></ul><ul><li>Modify the results if necessary. </li></ul><ul><li>Try the same search in a different search engine. </li></ul>
  13. 13. Evaluating Information Found on the WWW <ul><li>The WWW provides a vast amount of information without indicators of quality or accuracy. </li></ul><ul><li>Evaluation Guidelines </li></ul><ul><ul><li>Who is the author or institution? </li></ul></ul><ul><ul><li>How current is the information? </li></ul></ul><ul><ul><li>Who is the audience? </li></ul></ul><ul><ul><li>Is the content accurate and objective? </li></ul></ul><ul><ul><li>What is the purpose of the information </li></ul></ul>