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So the radar screen proves nothing, other than that writing software is difficult and even highly trained programmers make errors when interpreting relatively simple requirements.
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I agree that we need to keep in mind the possible errors in the system, but grad students are NOT highly trained programmers. Programmers
who have been working on that kind of system for years ARE highly trained programmers in this context only. Programmers do not know all systems and are not experts in all languages and areas of programming.
We use radar to keep one plane from crashing into another plane all the time and it does not often go wrong. Radar operators learn to know the quirks in the system and if they say there is an anomaly, then they are probably correct.
People who are not trained radar operators should not try to interpret that kind of data and an image of the radar screen does not 'mean' anything to people who dont know what they are looking at.