1.What is the difference between “Quality”, “Reliability” and “Safety”?

Quality is the "degree to which a specific product conforms to a design or specification"

Reliability is the probability that a component part, equipment, or system will satisfactorily perform its intended function under intended conditions for a specified period of time.

Safety is the state of being certain that adverse effects will not be caused by something under defined conditions.

These are different domains and usually good quality brings in reliability and safety.
Quality: wow this car drives fast!
Reliability: Piece of crap sounds like it's about to explode, but hey I made it to work on time.
Safety: Stupid piece of crap car sounds like it's about to explode, and I was 1/2 hour late for work because the back wheel came off. But look, not a scratch on the dashboard and my seatbelt's still on!

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