This statement is not true. An ideal control system should concentrate on key aspects of performance. There are several activities to be controlled. In practice, it is not possible for management to control each and every activity due to limited time. Moreover, minor deviations from plans and targets are insignificant for success. Therefore, an attempt to control everything is likely to be a futile exercise. Control system should focus attention on exceptional and key factors only. This will help to save time, efforts and money.
On the other hand, controlling each and every activity results in delays, increased cost and neglect of key items. The control system should be designed in such a manner that only significant deviations from the standards are reported to the higher level managers.