The measurement of time is perhaps is only quantity that can be measured extremely accurately by very low cost cost devices. However, when we look at qualification tests in regulated industries, we still require that stopwatches used for measuring time during an experiment to be calibrated.

The need for calibration is not driven by the need to ensure the watch is not wrong, but it is driven by the need to know that the watch is right.

This rule is true for all processes of manufacturing, data collection, and data analysis.

Are the validation for your processes based of the need to show *error-free operation* or the need to show *correct operation*? I believe the latter is superior