1. Making control decisions in an expert system is a problem-solving task;Barnett,1982
2. The advantages of abstract control knowledge in expert system design;Clancey,1983
3. Acquiring, representing, and evaluating a competence model of diagnostic strategy;Clancey,1984
4. A goal-directed Hearsay-II architecture: Unifying data-directed and goal-directed control;Corkill,1982
5. Applications of meta level knowledge to the construction, maintenance, and use of large knowledge bases;Davis,1976