Web & Databases Dania Bilal IS 530 Fall 2006.

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Presentation transcript:

Web & Databases Dania Bilal IS 530 Fall 2006

The Web Heterogeneous Dynamic Instant gratification Exploration & discovery Convenient & challenging Hypertext & hypermedia cognitive overload Disorientation

The Web Full-text documents can be downloaded at no cost Scholarly and non-scholarly information Hard to find information can be found Not all information is found on the Web Virtual reference sources Virtual reference assistance

The Web Authority of information Information literacy Inappropriate materials Evaluation of information is a must Information literacy Distinguishing among engines/directories Searching vs. browsing Evaluating, synthesizing, and using information effectively and efficiently

The Web Plagiarism Relevance judgment Social and other issues User-based System-based Social and other issues

The Web Mental maturity Reading vs. skimming texts Youth have high confidence in finding information on the Web Reading vs. skimming texts

Web Databases Lacks structure (no thesauri, controlled vocabulary, etc.) Lacks authority Sponsored sites Well-structured (thesauri, controlled vocabulary, metadata standards, etc.) Authoritative No sponsored sites

Web Databases Information overload Engines more general in nature Cognitive overload Gratification Engines more general in nature Item availability is questionable (dead links, error codes) Information overload Cognitive overload varies Gratification Many specialized databases Item availability depends on link resolver, policy?

Engines & Directories Crawler-based search engines Human-based web directories Hybrid search engines Mixed results from crawler- and human-based

How Search Engines Work? Crawler or spider Visits a Web page Reads a Web page Follows link on a Web page Spider returns to site on a regular basis for changes

How Search Engines Work? Gathered information goes to the database Information is indexed Matching algorithm Matches a user query to information in database

Blogs & Wikis Blog Wiki Go to Google and look up define:blog Go to Google and look up define:wiki

Search Engine Resources http://searchenginewatch.com/ http://searchengineshowdown.com Search features Search engine news Statistics Reviews of search engines Search strategies

Research Read this article http://searchenginewatch.com/searchday/article.php/3598011 Reports on search behavior of Web users