Reliability is a property of a system that lets us rely on it. It has to do with the correctness of its processing from input to output. This brings up two other words; accuracy and precision. Precision has to do with repeatability while accuracy is directly related to reliability in that it refers to absolute correctness. In target shooting; any arrows in the bulls eye are accurate while if all the arrows land together (no matter where) the shooter is precise. Precision is important to manufacturability in that we want to make things the same way each time.

Reliable systems always produce the correct or accurate result. A system can only be said to be accurate if it complies with the predefined requirements. Otherwise, it is what it does.

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