Quality Control: Measure it, Control it!

“‘Put it on the press and we’ll find out’ is worse than the rubber ruler concept,” he says. “You are taking the output of a process with a dozen variables (the plate) and using a process with six dozen variables (the printing press) to ‘measure’ it. The trouble with this situation is easily demonstrated when re-running a job. It should be trivially simple to obtain the same result on press, but it is not.”