A debugger suitable for use with rule-based expert systems allows a user to set breakpoints defined by selected conditions and events which can occur during execution of the expert system. An inference engine used to execute the expert system executes a procedure call to the debugger whenever selected inferencing activities are performed. The debugger determines whether the inference engine should be halted by comparing current conditions within the expert system with predefined breakpoints. When a breakpoint is reached, a user is allowed to examine and change various aspects of the expert system and its course of execution. Control is then returned to the inference engine for further execution.
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