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PID is very related to CS, especially in the domain of digital signal processing. And yup, I would agree that there are a lot of non-CS engineers here, we are pretty common :)

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any large-ish system is going to have admission control and stability issues, better design those than leave them to chance...

I learned this in control systems in electrical engineering course. Maybe graduate courses do have PID for CS majors, but haven't seen them yet

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