For the things we have to learn before we can do them, we learn by doing
them. Aristotle Teaching should be such that what is offered is
perceived as a valuable gift and not as a hard duty. Albert Einstein The
second most important job in the world, second only to being a good
parent, is being a good teacher. S.G. Ellis The fast technological
changes and the resulting shifts of market conditions require the
development and use of educational methodologies and opportunities with
moderate economic demands. Currently, there is an increasing number of
edu- tional institutes that respond to this challenge through the
creation and adoption of distance education programs in which the
teachers and students are separated by physical distance. It has been
verified in many cases that, with the proper methods and tools, teaching
and learning at a distance can be as effective as traditional fa-
to-face instruction. Today, distance education is primarily performed
through the Internet, which is the biggest and most powerful computer
network of the World, and the World Wide Web (WWW), which is an
effective front-end to the Internet and allows the Internet users to
uniformly access a large repertory of resources (text, data, images,
sound, video, etc.) available on the Internet.