Abstract
This paper proposes a tandem architecture for cooperating heterogeneous expert systems in the context of concurrent engineering. Two levels of meta and working expert systems are involved. The working-level expert systems, which may be implemented in their own computational environments and in private proof languages, are mainly for application computation. The meta-level expert systems, using a common argument language, are mainly responsible for communication among themselves and between the two levels. By this approach, the stand-alone capability of individual systems is retained at the working-level and cooperation is achieved effectively with minimum embellishment at the meta level. Deductive inference language (DIL) is a set of extended A GENTS predicates for defining messages passed between meta- and working- level systems, actuators for interpreting DIL messages into actions, and converters for variable instantiation.
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