Software that tries to build up a view of the world by asking questions and using the answers to navigate a tree of knowledge.  I think...















'Nother way to think about it:  a programming style that
emphasizes a "knowledge base" and "inference engine" which
acts on that base.  Forward and backward (inferential) chaining
are typical components.








[CLIPS] is an open-source expert-system development environment
in widespread use.

















[[ [Arjen Markus] is working on a [Tcl]-coded ES in 2003.]]