Software Development and Testing
Someone should ask Boeing whether the software was developed using "agile" or "scrum".
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If yes, then Boeing should be asked about how the MCAS "user story" (or "use case") was integrated into the rest of the software environment on the MAX. If the process simply tested the CHANGES (i.e. only the new MCAS software on its own), then a part of the problem is the whole software development and testing process.
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....and of course Boeing would self-certify the process!!