Abstract
Considerable interests have been expressed in developing a tool for building Second Generation Expert Systems (ESs). The C-Oriented tool ZIP/E ++ is developed to verify the authors' ideas on what characteristics such tools should have. New mechanism such as four-level inference control scheme with news posting/delivering model and built-in explanation facility are introduced; rich semantical knowledge representation and multiple inference engines are integrated; a knowledge acquisition shell ZIFS is offered to help domain experts to acquire the domain knowledge; a truth maintenance system for ESs built by ZIP/E ++ and multiple knowledge bases organizing, scheduling and intercommunication are provided; a knowledge-based expert system building model CIA-model also is considered. The most important features of ZIP/E ++ are: (1) It is a general tool suitable for building various domain ESs; (2) It is a flexible tool for integrating different kinds of inference engines and knowledge representations into a single system; (3) It is a tool with deep-level reasoning model for coupling heuristic reasoning and domain reasoning [6]; (4) It is a very efficient tool for problem solving; (5) It is a tool with well-developed environment to support the ESs building.
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