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Internet Searching Version2
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Internet Searching Version2



Internet Searching Training for ICIMOD staff 2005

Internet Searching Training for ICIMOD staff 2005



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Internet Searching Version2 Internet Searching Version2 Presentation Transcript

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