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 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 from the standards are reported to the higher level managers.

(i) Making efficient use of resources By exercising control, a manager seeks to reduce wastage and spoilage of resources. Each activity is performed in accordance with predetermined standards and norms, which helps in effective and efficient utilization of resources.
(ii) Improving employees' motivation  Controlling helps employees in realizing what they are expected to do and what are the standards of performance. This motivates them to perform better. 

Planning and controlling are interrelated and interdependent
Planning is the base of controlling function, as controlling involves measurement of performance against the standards to analyze deviations and take corrective action. Thus, controlling is impossible without planning.
Planning without controlling is meaningless because, in the absence of controlling, it is impossible to minor the progress and keep a check on the proper implementation of plans. Thus, without controlling, planning will fail to achieve objectives.
Planning is a thinking process while controlling is an executive function. While planning involves creative thinking, imagination and sound judgment, controlling ensures that such decisions are converted into desired actions. Thus, planning is prescriptive, whereas, controlling is evaluative.
On the basis of the above discussion, it is concluded that planning and controlling are interrelated and reinforce each other because:
(i) Planning based on facts makes controlling easier and effective.
(ii) Controlling improves future planning by providing information derived from past experiences. 
Both are Forward-looking as well as Backward-looking Functions
1. Planning is a Forward-looking Function
Planning involves setting objectives and deciding the future course of action to achieve them. Thus, it is regarded as a forward-looking function.
2. Controlling is a Backward-looking Function
Controlling involves a post-mortem of the past activities of an enterprise and finding out deviations from the targeted standard. Thus, it is regarded as a backward-looking function.
3. Planning is a Backward-looking Function
Planning is guided by the past experiences and corrective actions taken in the controlling process. Thus, it is regarded as a backward-looking function.
4. Controlling is a Forward-looking Function
The process of control necessarily involves analyzing deviations and taking corrective action, which aims to improve future performance and achievement of predetermined goals. Thus, it is regarded as a forward-looking function.

Importance of controlling
Controlling is an indispensable function of management due to the following reasons:
1. Accomplishing Organizational Goals
It measures progress towards the organizational goals and find out deviations. In the absence of control system, activities may not be carried out according to plans. Thus we can say, it guides the organization and keeps it on the right track, so that it can attain its goals.
2. Judging Accuracy of Standards
Through an effective control system, managers can easily judge the accuracy of standards. It also keeps a careful check on the changes taking place in the organization and in the environment, which facilitates the review of standards, in the light of such changes.
3. Making efficient use of Resources
By exercising control, a manager seeks to reduce wastage and spoilage of resources. Each activity is performed in accordance with predetermined standards and norms, which helps in effective and efficient utilization of resources.
4. Improving Employees Motivation
It helps employees in realizing, what they are expected to do and what are the standards of performance, on the basis of which they are appraised. This motivates them to perform better.
5. Ensuring Order and Discipline
By keeping a check on the activities of the workers, controlling creates an atmosphere of order and discipline among them. It also helps to keep a check on the dishonest behavior of employees.
6. Facilitating Coordination in Action
It provides direction to all activities and each department and employee is governed by predetermined standards, which helps in establishing coordination among them.