EXPLAINING CONTROL STRATEGIES IN 2ND-GENERATION EXPERT-SYSTEMS

Explaining control strategies is an important aspect in second generat ion expert system explanation. With explicit representation of control , it is possible to construct explanations at different levels of abst raction so as to satisfy different needs, This paper presents our work on explaining control strategies within the context of the system too l, CARMEN. CARMEN's methodology for modeling control knowledge (MMCK) uses problem-solving entities (i.e., tasks, meta-knowledge sources (MK S's), basic-knowledge sources (BKS's) and engines) to integrate differ ent kinds of knowledge and reasoning. These entities reflect the ways experts organize their problem solving activities, Explanations about control strategies can be clearly given according to the roles these e ntities play in problem solving.