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Web Search Tools How to get the most out of search engines, web directories, and meta-searchers The “Invisible” Web Sometimes called the “Deep Web” Information that search engines cannot or refuse to index because it is locked up within databases

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web search tools

Web Search Tools

How to get the most out of search engines, web directories, and meta-searchers

the invisible web
The “Invisible” Web
  • Sometimes called the “Deep Web”
  • Information that search engines cannot or refuse to index because it is locked up within databases
  • At least 500 times bigger than the part of the web “visible” to search engines
  • Want to know more? Go to www.brightplanet.com
  • The bottom line: DON’T RELY ON GENERAL WEB SEARCH TOOLS FOR ALL YOUR INFORMATION NEEDS!
web indexes directories review sites
Built by humans

Selective

Evaluated

Organized according to a scheme

Most like a Subject search on ALICE

Based on a thesaurus (pre-defined list of terms)

Includes see & see also references

Two types of searching: browse and keyword

Can use various search techniques to focus results

Not a “live” search

Major advantage: user-friendly; can be easily browsed

Major disadvantage: limited number of sites indexed

Web Indexes, Directories & Review Sites

Cannot find information located inside other databases,

e.g., ALICE or Academic Search Premier.

web search engines
Built by “robot” programs, not humans

Not selective

Not evaluated

Results “arranged” but not organized

Most like a keyword search on ALICE

No thesaurus

No cross-references

Keyword searching only

Must use keyword search techniques to focus results

Not a “live” search

Major advantage: can locate information “buried” inside web pages

Major disadvantage: can bring back too many results

Web Search Engines

Cannot find information located inside other databases,

e.g., ALICE, Periodical Abstracts, etc.

meta search tools
Results gathered by sophisticated search programs

Not selective

Not evaluated

Results “arranged” but not organized

Most like an “automated” reference librarian

No thesaurus

No cross-references

Keyword searching only; search once – multiple results (in simultaneous meta-searchers)

Can use limited keyword search techniques

Not a “live” search

Major advantage: saves time and keystrokes

Major disadvantage: can’t customize each search

Meta-Search Tools

Cannot find information located inside other databases,

e.g., ALICE, Periodical Abstracts, etc.

points to remember
Points to remember…
  • It’s not all on the web!
  • Remember the Invisible Web
  • Directories vs. Search Engines
  • Use Advanced Search features
  • No search engine is perfect
  • Evaluate, Evaluate, Evaluate!