2. Characteristics of Information on the Web Dania Bilal IS 530 Fall 2005

3. The Web  Heterogeneous  Dynamic  Hypertext & hypermedia cognitive overload disorientation

4. The Web  Structure of information  Information overload  Authority  Inappropriate materials Filtering issues

5. Web Spaces  Search /directory space  Web browser space Navigation efficiency  Variables Navigation effectiveness  Variables

6. Web Spaces Search engine Web browser

7. The Web  Text-centered (mostly)  Efforts to read texts online  Advertisements  Instant gratification  Exploration & discovery

8. The Web  Plagiarism  Evaluation of retrieved information  Relevance judgment  Social issues  Information literacy

9. The Web  Mental maturity (content vs. ads)  Reading long texts online  Sifting through K-Z of results  Composing adequate search strings  Identification of authoritative information

10. Web Databases  System-based relevance (Google: popularity ranking)  Sponsored sites may appear first  Lacks structure (no thesauri, controlled vocabulary, etc.)  Lacks authority  System-based relevance (other methods)  No sponsored sites  Well-structured (thesauri, controlled vocabulary, metadata standards, etc.)  Authoritative

11. Web Databases  Information overload Cognitive overload Gratification vs. negative affect  Engines more general in nature  Item availability is questionable (dead links, error codes)  Less information overload cognitive overload varies Gratification >positive affect  Many specialized databases  Item availability?

12. How Search Engines Work? Search Engine Resources  http://searchenginewatch.com/webmasters/ article.php/2168031 (how search engines work) http://searchenginewatch.com/webmasters/ article.php/2168031  http://www.searchengineworld.com/misc/re source.htm (search engine resources) http://www.searchengineworld.com/misc/re source.htm  http://www.lib.berkeley.edu/Help/search.ht ml (recommended search engines) http://www.lib.berkeley.edu/Help/search.ht ml