Question: what are the requirements of a good control system?
Answer: Focus on Objectives. The control system should always focus on objectives. ... 
Suitability. The control system should be suitable to the needs of the organisation.
Promptness. The control system should be prompt. ... 
Flexibility. The control system should be flexible. ... 
Forward Looking. ... 
Economical. ... 
Simplicity. ... 
Motivating.