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190 Chapter 6

Supreme genus Substance

Differentiae Material Immaterial

Subordinate genera Body Spirit

Differentiae Animate Inanimate

Subordinate genera Living Mineral

Differentiae Animate Insensitive
Differentiae Animal Plant

Proximate genera Rational Irrational

Species Human Beast

Individuals Socrates Plato Aristotle etc.

Tree of Porphyry, as it was drawn by the logician Peter of Spain (1329).
It illustrates the categories under substance, which is called the supreme genus
or the most general category.

Figure 6.4
Example of a semantic network

and printing the fi le. Assistant agents that help the user to do what he or she is trying
to do can then reuse these episodes. The assistance episodes themselves can also be
reused in the future (see fi gure 6.6 ). In this way, the system has modeled how users
behave when they are undertaking these particular types of tasks.
The important factor to note here is that user modeling is an ongoing process, not
a one-shot deal. Dynamic profi ling systems need to be developed based on a mix
of human and automated trace facilities, in order to be able to continually adapt
to changes in the environment, changes in the organization, and changes in the
individuals themselves (e.g., different job responsibilities, different preferences, new
competencies, and new interests).