Microsoft spent the decade after 2002 improving its software development process to minimize the number of security vulnerabilities in shipped software. Its products are by no means perfect—that’s beyond the capabilities of the technologies right now—but they’re a lot better than average. Apple is known for its quality software. So is Google. Some very small and critical pieces of software are high quality. Aircraft avionics software is written to a much more rigorous quality standard than just about everything else. And NASA had a famous quality control process for its space shuttle software.
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