In the control process, measurement must be accurate enough to identify significant differences between what is really taking place and what was originally planned.

Control Process

The systematic effort by business management to compare performance to predetermined standards, plans, or objectives in order to determine whether performance is in line with these standards and presumably to take any corrective action required.

Measurement

The process of quantifying attributes or phenomena, typically using instruments or standardized tests, to obtain data.

Significant Differences

Implies statistically or practically meaningful discrepancies between data sets, groups, or results.