ABSTRACT
The history of our domain knowledge base is a stormy one. Thewhole knowledge base has been torn apart and completely re-built six times and Jay Yusko (Yusko & Evens, 2002, 2004) is now building a completely new seventh version. The Domain Knowledge Base contains the knowledge about the cardiovascular system that the system is attempting to help students understand and use in solving problems, so it is vital to our system. All the major modules of the system potentially make use of the Domain Knowledge Base. Its most immediate customer, however, is the Problem Solver, which generates predictions for all of the procedures presented to the students and the answers to questions. The Problem Solver and the Domain Knowledge Base are so closely linked that it has been necessary to rebuild it every time that the knowledge base was rebuilt.
