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The approach Jazuela describes is typically called a skill-tree (or a skill-web, for the version with interdependancies). It's the same approach used by many RTS computer games for technology development, although some games (such as Diablo2) use it for skills as well. It's also used by some roleplaying games (GURPS Magic has quite a nice version) and is quite a popular approach for many of the newer generation of muds.
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