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HEST is a practical integrated expert system tool. Its basis is a knowledge programming language FFLL, characterized by a combination of fuzzy logic and function paradigms. The tool integrates a lot of important knowledge processing capabilities such as fuzzy reasoning, function computation, knowledge compilation and explanation, knowledge base maintenance, as well as practical programming functions, e.g., editing, filing, compiling, module-imbedding, etc., constructing, a user-friendly knowledge application environment, HEST can enable expert system development in various domains quickly and easily. This paper gives an outline of the design and implementation of HEST.