1. A method for identifying the test coverage of a test sequence that is executed in a rules-based expert system having an inference engine, the execution of the test sequence causing the rules-based expert system to apply a number of rules selected from a number of available rules and execute one or more of the rules that are applied, the test coverage indicating the degree that the test sequence was successful in exercising each of the number of available rules in the rules-based expert system, the method comprising the steps of: a. providing a first indicator for each of the number of available rules of said rules-based expert system having said inference engine; b. setting the first indicator for a particular rule when that particular rule is applied; and c. determining the number of rules that were applied during the execution of the test sequence by examining the first indicator for each of the available rules.