Trekking through the world of information
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Transcript of Trekking through the world of information
Image: 'flickr time'www.flickr.com/photos/86438096@N00/274238061
Effective Search
Strategies for
Teachers
Definition of the Net The Internet is the publicly accessible
worldwide system of interconnected computer networks that transmit data by packet switching using a standardized Internet Protocol (IP).
It is made up of thousands of smaller commercial, academic, domestic and government networks. It carries various information and services, such as electronic mail, online chat, and the interlinked web pages and other
documents of the World Wide Web.
How big is the web?
• 56 billion static web pages are publicly available on the World Wide Web.
• Another estimated 6 billion static pages are available within private intranet sites
• 200+ billion database-driven pages are available as dynamic database reports ("invisible web" pages)
• Google.com indexes 9.75 billion web pages.
Image: 'Released to Public: Sinai Penninsula and Dead+Sea+from+Space+Shuttle+Columbia,+March+2002+(NASA)'www.flickr.com/photos/39735679@N00/491430005
Today
• 200 billion pages
• Only 50 Billion is static web
• Google has only indexed 20%
• Daily Web Space increases by 100,000 websites
Image: 'LOGO2.0 part I'http://www.flickr.com/photos/16851909@N00/93136022
Search Strategy
• Choose appropriate key words
• Select right tools
• Evaluate Information
Image: 'http://www'www.flickr.com/photos/65919269@N00/557840620
Searching the Free Web
Image: 'PSP Browser vs Landscape Dell X50v’www.flickr.com/photos/44124452748@N01/29502230
•Use Advanced Searching
A few search engines
Metacrawler
Boolean Searching
Add +ABC
Minus -ABC
Default DEF OR ABC
Exact phrase “ABC”
Wild card ABC*
Synonym ABC~
Samples
OR NOT
AND
http://www.internettutorials.net/boolean.html
Deep Web• The invisible web is a vast repository of information
that search engines don't have access to, such as databases
• Private networks, called intranets, that are not actually hooked up to the Web
• Forms, like ColdFusion or CGI
• Password-protected sites, like a university library
• Sites that intentionally, for various reasons, keep their information from being indexed by search engine spiders
Image: 'Andromeda, again.'www.flickr.com/photos/13447091@N00/251478651
Effective habits:
•What do others like?
•Use The "Three Strikes" Rule
•Don't Play Favorites
•Use Specialized Search Sites
Image: 'no denial'www.flickr.com/photos/60648084@N00/2462966749
Web Evaluation Techniques
Before you click to view the page...
• Look at the URL - personal page or site ? ~ or % or users or members
• Domain name appropriate for the content ? edu, com, org, net, gov, ca.us, uk, etc.
• Published by an entity that makes sense ? • News from its source?
www.nytimes.com
• Advice from valid agency? www.nih.gov/www.nlm.nih.gov/www.nimh.nih.gov/
Web Evaluation Techniques Scan the perimeter of the page• Can you tell who wrote it ?
• name of page author• organization, institution, agency you recognize• e-mail contact by itself not enough
• Credentials for the subject matter ?– Look for links to:
“About us” “Philosophy” “Background” “Biography”
• Is it recent or current enough ?• Look for “last updated” date - usually at bottom
Web Evaluation Techniques
Indicators of quality
• Sources documented• links, footnotes, etc.
– As detailed as you expect in print publications ?
• do the links work ?
• Information retyped or forged• why not a link to published version instead ?
• Links to other resources• biased, slanted ?
Web Evaluation Techniques
What Do Others Say ?
• Search the URL in alexa.com
– Who links to the site? Who owns the domain?
– Type or paste the URL into the basic search box
– Traffic for top 100,000 sites
• See what links are in Google’s Similar pages
• Look up the page author in Google
Web Evaluation Techniques
STEP BACK & ASK: Does it all add up ?• Why was the page put on the Web ?
• inform with facts and data? • explain, persuade? • sell, entice?
• share, disclose?• as a parody or satire?
• Is it appropriate for your purpose?
Try evaluating some sites...
1. Search a controversial topic in Google:– "nuclear armageddon"– prisons danger– “stem cells” abortion
2. Scan the first two pages of results
3. Visit one or two sites – try to evaluate their quality and reliability
Other Internet Politics
Copyright, Fair Use & Plagiarism
• Where did the info come from?– public domain? creative commons? – Giving credit
Citation Generator
http://theconnectedclassroom.wikispaces.com/Digital_Images
Why Use NetTrekker?
Searches are Academically relevantImage: 'Questions'http://www.flickr.com/photos/42788859@N00/318947873
Why Use NetTrekker?Educator reviewed & evaluated• Aligned to state standards
• Read Aloud
• Rated by readability level
Image: 'question mark ?'www.flickr.com/photos/49968232@N00/12364944
Image: 'question mark ?'www.flickr.com/photos/49968232@N00/12364944
http://middle.nettrekker.com/userinfo/pa.eplhttp://middle.nettrekker.com/userinfo/pa.epl
CreateCreate
User NameUser Name
PasscodePasscode
& enter & enter YOUR IU’SYOUR IU’S
KeywordKeyword
school.nettrekker.comschool.nettrekker.com
• Keyword– Web– Persons– Images– Standards
• Drill down through headings
• Timeline
• Elementary – Theme Search
Let’s Start Searching!