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ITIS 1210 Introduction to Web-Based Information Systems

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Title: ITIS 1210 Introduction to Web-Based Information Systems


1
ITIS 1210Introduction to Web-Based Information
Systems
  • Internet Research Three
  • Browsing Subject Guides

2
Introduction
  • Subject guides
  • aka subject directories, Internet directories,
    subject trees
  • Subject guides
  • Help focus searches
  • Useful if your knowledge of the subject is too
    limited to judge the results you get from regular
    search engines
  • Group information by topic
  • Lets you see both breadth and depth

3
Introduction
  • Browse by drilling down
  • Navigate through hierarchical subject headings
  • Upper levels are general
  • Lower levels more and more specific
  • Some permit keyword searches also

4
Understanding Subject Guides
  • Data typically compiled and arranged by experts
  • Offers greater selectivity and quality of data
  • But less coverage than regular search engines
  • Emphasis on quality not quantity
  • Links may be annotated with useful information

5
Understanding Subject Guides
  • Subject guide resource
  • http//www.lib.lsu.edu/weblio.html
  • Librarians Index to the Internet www.lii.org
  • Click a bold topic to see a list of sub-topics
  • Click a non-bold topic to see a list of Web pages
    about that topic

6
Understanding Subject Guides
  • Searchable
  • UC Berkeley
  • http//www.lib.berkeley.edu/TeachingLib/Guides/Int
    ernet/SubjDirectories.html
  • infomine.ucr.edu
  • Annotations
  • Summaries or reviews of Web page content
  • Usually written by a subject guide contributors
  • Typically an expert in the field
  • http//www.lii.org/pub/topic/webdesign

7
Understanding Subject Guides
  • Distributed subject guides
  • WWW Virtual Library - http//vlib.org/
  • Open Directory Project - http//dmoz.org/
  • Created by contributors working independently
  • Each group/person responsible for a subtopic

8
Understanding Subject Guides
  • Not stored on one computer
  • Distributed to different computers around the Web
  • Many independent contributors have
  • Different levels of expertise
  • Varying resources
  • May make distributed subject guides of uneven
    quality and show lack of standardization

9
Understanding Subject Guides
  • Maintenance by experts
  • Balances problems with quality
  • They know best whats available on the Web
  • Topics may be organized differently between
    different guides
  • energy under Science in one, under
    Engineering in another

10
Understanding Subject Guides
  • Searchable subject guides typically search only
    their own data

11
Understanding Subject Guides
  • Trailblazer pages
  • Created by scholars and experts
  • Trying to organize and link to the best Web sites
    in their field
  • Excellent source for reliable information
  • May be broad or narrow in scope
  • All trying to cover their topic well

12
Understanding Subject Guides
  • Usually provides
  • Links to useful sites
  • Logical way of navigating subject
  • May provide
  • Search capability
  • Site map
  • Example EERE

13
Understanding Subject Guides
  • Trailblazer pages
  • Example http//www.eere.energy.gov/

14
Specialized Search Engines
  • Specialized search engines
  • Best features of regular search engines
  • Subject guides
  • Limit the Web pages they search for
  • Available for
  • Law
  • Medicine
  • Technology

15
Specialized Search Engines
  • Where do you find specialized search engines?
  • http//webquest.sdsu.edu/searching/specialized.htm
    l

16
Evaluation Criteria
  • Standards to determine if a Web page is
    appropriate for your needs
  • How does Web information get to you?
  • Directly from author
  • Via an editorial process
  • Online journals
  • Recommended
  • Search engine

17
Authority
Objectivity Accuracy
Organization
Appropriate
Scope
Currency
18
Evaluation Criteria
  • Authority (credibility/reliability)
  • Is the author identified?
  • Are their qualifications identified?
  • Are resources documented?
  • Is there contact information for the author(s)?
  • Is the author associated with
  • University
  • Organization
  • Government agency

19
Evaluation Criteria
  • Organization (appearance vs. content)
  • Is site well designed, functional?
  • Easy to navigate?
  • Searchable?
  • Site map or Help page?

20
Evaluation Criteria
  • Scope (range of topics)
  • Who is the intended audience?
  • Students, professionals, amateurs?
  • Introduction explaining purpose of site?
  • Is scope appropriate for your needs?
  • Too broad
  • Too narrow

21
Evaluation Criteria
  • Currency (timeliness)
  • Creation/revision date?
  • Broken links
  • Not being maintained

22
Evaluation Criteria
  • Objectivity accuracy
  • Advocacy is OK if revealed
  • Does author state purpose of site?
  • Content presented as fact or opinion?
  • Are resources well documented?
  • Host of site identified?
  • What do other sites say about this site or its
    author?
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