Engineers and researchers demand microscopic accuracy

The story of the stolen crossbow was one of precision without accuracy.William got the same wrong result each time he fired.The variation with the shaky hand was one of accuracy without precision.William's bolts clustered around the correct result,but without certainty of a bullseye for any given shot.You can probably get away with low accuracy or low precision in everyday tasks.But engineers and researchers often require accuracy on microscopic levels with a high certainty of being right every time.