The controlling process starts by setting standards.
The information is gathered about work done and actual position.
The work executed (performance) is measured.
The comparison of work executed is made with set standards.
After evaluating work the same is compared to set standards and if deviation/s is/are found corrective measures are taken. For this out of the given three measures any measure is taken:
No change in condition.
Change the condition to remove deviation,
Change the condition and establish the fresh standards.