ENDNOTES

1. Preliminary work and first version of the system was described in Abi-Aad et al. (2001).

2. The term Preference Indication by Example was introduced in Abi-Aad (2001).

3. http://www.trl.ibm.com/projects/mrm/dp/index_e.htm

4. Information about various aspects of agents' development and use can be found at http:// agents .umbc.edu/

5. Other attributes often considered pertinent for agents include reactivity, temporal continuity, personality, and mobility (see Etzioni & Weld, 1995; Franklin & Graesser, 1996).

6. These approaches correspond to two kinds of modern knowledge acquisition tools described in the previous chapter: knowledge elicitation tools and knowledge capture tools.

7. http://www.epistemics.co.uk/products/pcpack/

8. http://tiger.cpsc.ucalgary.ca/WebGrid/WebGrid.html

9. http://www.isi.edu/expect/

10. http://protege. stanford .edu/index.html