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Robust Testing is a systematic test method that uses the OATS (Orthogonal Array Testing System) tool to convert information from product requirements or specifications into a concise set of tests. We found Robust Testing more than twice as productive as conventional testing practices for testing PMX/StarMAIL Release 2.2, a complex private mail exchange (PMX) local area network (LAN)-based electronic mail product that works with several types and versions of LAN software, operating systems, and personal computers (PCs). Robust Testing required less time, enabling us to complete testing on schedule. It found more potentially user-affecting faults, and inspired greater confidence in the quality of the delivered product.
Brownlie et al. (Wed,) studied this question.