Internet Searching Version2


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Internet Searching Training for ICIMOD staff 2005

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Internet Searching Version2

  1. 1. ICT Capacity Building Internet Searching Deependra b. Tandukar, ICIMOD
  2. 2. Internet Searching <ul><li>a comprehensive introduction to web searching methods and techniques </li></ul><ul><li>explains ways to find what you are actually looking for </li></ul>
  3. 3. Key Topics <ul><li>Overview of the World Wide Web </li></ul><ul><li>Searching tools </li></ul><ul><li>Queries/Keywords </li></ul><ul><li>Tool selection </li></ul><ul><li>Power search </li></ul><ul><li>Evaluating the results </li></ul>
  4. 4. World Wide Web <ul><li>Internet is an inter-connected network of networks – www is the web virtually linking these networks </li></ul><ul><li>most rely on Internet Searching for finding information </li></ul><ul><li>billions of web pages </li></ul><ul><li>at least a single page on your desired topic </li></ul>
  5. 5. Searching Tools <ul><li>Web directories / Virtual Library </li></ul><ul><li>Search engines / Meta search engines </li></ul><ul><li>Deep web databases </li></ul>
  6. 6. Web Directories <ul><li>repositories of useful web sites arranged into a hierarchical, subject-based structure </li></ul><ul><li>hand picked by the professionals and classified according to that particular direcotory service – hence limited to the subject/topic provided by the service </li></ul><ul><li>,, </li></ul>
  7. 7. Virtual Library <ul><li>web directory that includes highly selective links mostly by librarians </li></ul><ul><li>reviewed and evaluated by subject specialists for their accuracy and content </li></ul><ul><li>,, </li></ul>
  8. 8. Search Engines <ul><li>index each document in its database </li></ul><ul><li>when a query is posed, it matches the query against the records it has, to present a list of possible documents </li></ul><ul><li>even the biggest search engines do not index all the Internet’s documents </li></ul><ul><li>,, </li></ul>
  9. 9. Metasearch Engines <ul><li>send query simultaneously to several search engines, web directories and sometimes to the deep web </li></ul><ul><li>remove the duplicate links and combine the results into a single merged list </li></ul><ul><li>take only the top 10 or 20 from each search engine </li></ul><ul><li>, </li></ul>
  10. 10. Deep Web Databases <ul><li>invisible or hidden web databases </li></ul><ul><li>not linked to by other pages – dynamic pages </li></ul><ul><li>not indexed by standard search engines </li></ul><ul><li> – over 70,000 searchable databases </li></ul><ul><li> (digital library project – University of California, Berkeley) </li></ul>
  11. 11. Tool Selection <ul><li>distinctive word or phrase – search engines </li></ul><ul><li>seek an overview – web directories </li></ul><ul><li>facts, maps, datas – deep web </li></ul><ul><li>switch from one tool to another </li></ul>
  12. 12. Phrase Searching <ul><li>an effective way to increase the relevance of &quot;hits&quot; is to search as a phrase </li></ul><ul><li>“ internet training&quot; is a different search than internet training in most search engines </li></ul>
  13. 13. Queries <ul><li>finding information on the Internet depends on using the keywords precisely and the search services effectively </li></ul>
  14. 14. Keywords <ul><li>fundamental aspects of a search </li></ul><ul><li>nouns most often </li></ul><ul><li>keep in mind the who , what , where , when , how and why in formulating the query </li></ul><ul><li>avoid articles , pronouns , conjunctions or prepositions – also called “stop words” </li></ul>
  15. 15. Power Search <ul><li>overview of possible techniques </li></ul><ul><li>boolean search </li></ul><ul><li>field search </li></ul>
  16. 16. Boolean Search <ul><li>boolean logic and set theory </li></ul><ul><li>simple to learn </li></ul><ul><li>adds tremendous effectiveness </li></ul><ul><li>boolean operators - AND , OR , and AND NOT </li></ul><ul><li>“ boolean logic” AND “George Boole” </li></ul>
  17. 17. AND <ul><li>documents that contain all the words – dogs AND cats </li></ul><ul><li>narrows a search </li></ul><ul><li>can be used to chain a number of required terms or phrases – “sustainable development” AND mountain AND women </li></ul>
  18. 18. OR <ul><li>documents that contain either word – dogs OR cats </li></ul><ul><li>broadens a search </li></ul><ul><li>use to include synonyms - tutorial OR guide </li></ul><ul><li>overuse can cause results sets to grow too large to be useful </li></ul>
  19. 19. AND NOT <ul><li>BUT NOT or NOT and denoted by minus sign ( - ) </li></ul><ul><li>removes any documents that contain the term or phrase immediately after – training NOT ICT or training –ICT (note: no space between “–” and ICT ) </li></ul>
  20. 20. Other Operators <ul><li>NEAR , BEFORE , AFTER </li></ul><ul><li>not supported by major search engines </li></ul><ul><li>all supported operators can be accessed via Advanced Search </li></ul>
  21. 21. Field Searching <ul><li>used from Advanced Search </li></ul><ul><li>specify where to look your keyword in the web document – title, URL </li></ul>
  22. 22. Nesting <ul><li>search engines may get confused if we use something like – &quot;pan pizza&quot; AND coke OR icecream AND cheese </li></ul><ul><li>but if we change to - &quot;pan pizza&quot; AND (coke OR icecream) AND cheese </li></ul>
  23. 23. Search Math <ul><li>exact form of word </li></ul><ul><li>“ - ” excludes, </li></ul><ul><li>“ + ” requires </li></ul><ul><li>training –internet </li></ul><ul><li>training +internet </li></ul>
  24. 24. Evaluating the Results <ul><li>anybody can publish on the web </li></ul><ul><li>check: </li></ul><ul><li>source – government agencies, eudcational institutions, libraries, prestigious publications/organisations </li></ul><ul><li>cross check other sources as well </li></ul><ul><li>updated date </li></ul><ul><li>use your logic </li></ul>
  25. 25. Thank You <ul><li>there is no “ one ” way to search on the Internet </li></ul>