Having worked in safety critical systems software, I'd say it was a multipoint failure. While the initial problem was the decision to use MCAS to get through wi

Having worked in safety critical systems software, I'd say it was a multipoint failure. While the initial problem was the decision to use MCAS to get through without retraining, any person working on the software should also have realized that relying on a single input is not ok. It was management failure + requirements engineering failure + software engineering failure. It was caused by management's greed and short-sightedness, but it could have been caught at more points in the process.