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<p><b>Abstract</b>—Special features of process control expert systems (PCX) make it both necessary and feasible to test them in a comprehensive manner. FAITH, an automated regression testing environment for PCX, integrates five specially adapted testing techniques, exploiting external specifications gained from the process control environment. FAITH also offers a set of metrics which can be used to predict testability during the early phases of PCX development. FAITH has been developed for a major German chemicals company where it is routinely used for certifying PCX, and for guiding design-for-testability.</p>
Test methods, measurement environment, expert systems, process control, external specification, process control expert systems (PCX), test metrics.

R. Soltysiak, M. Jarke, K. Finke and P. Szczurko, "Testing Expert Systems in Process Control," in IEEE Transactions on Knowledge & Data Engineering, vol. 8, no. , pp. 403-415, 1996.
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