Search engines and Web directories
Finding Specifc Information
Find the information agents text, which we
used last week, on the web. Search for it using the following
search engines and write down for each engine how many copies
of the text you can find.
1) Find categories in
Open Directory Project
where "information agents" belong. Note that the categories are not
called "information agents" and that
Yahoo uses Google for its "Web Page Matches". For this exercise
only look at the categories not at the "Web Page Matches".
2) Find an introduction to object-oriented programming that explains
it without using a specific programming language.
Try it first on a Search engine (Google)
and then in a Web directory (Yahoo).
Which is the appropriate Yahoo category?
Try the same search in the Open Directory
3) Find a tutorial for "DOM" (meaning the "Document Object Model") in
Open Directory Project and
have a category in which the DOM tutorial can be found? Compare
Yahoo's "Web Page matches" (i.e. its use of Google) with searching on
Type "DOM" into
Vivisimo. Can you get an idea
of what DOM is about by looking at the categories
(which are generated by "document clustering")?
Further search options
Try searches for your name (if you have some web pages other than
or the name of someone you know (if you don't have pages yourself.
Note that pages on php.indiana.edu are often excluded from search engines
because of a setting on php.indiana.edu that does not permit spiders
or robots.) Try all the different search engines and directories
mentioned before. Which ones work best? Try different combinations
of the name, eg "firstname lastname" or "lastname firstname"
or putting the name in double quotes. Do these make a difference?
Try the different advanced search options on
Do they make a difference?
More Search Tips
Here is a site that has more
search tips and examples.