Critical Software Testing Requirements Ultra Electronics needed test tools to comply with the strictest software testing re - quirements of civil avionics standard DO-178B Level A and UK Defence Standard Mil Std 00-55 projects. These mandated the unit testing of all code on the embedded target board and the achievement of 100% code coverage up to MC/DC. Ultra Elec- tronics’ requirements were summed up by Peter Devlin in just one word ‘confiden

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