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  • Go back farther, to Don Good's team at UT Austin, and their work in the 1970s and early 1980s with the Gypsy Verification Environment. They demonstrated that error-free code was possible, by delivering a proven error-free Message Flow Modulator to the Navy. The acceptance test suite was developed by a completely different group. When the MFM saw the acceptance test suite, for the first time, at the Acceptance Test, it passed, with NO deviations, waivers, or "yeah but"s. Commented Oct 6, 2010 at 14:43