Policy-making, decision-taking, and control: These are the three functions of management that have intellectual content. - Anthony Stafford Beer

The aim of management science is to display the best course of action in a given set of circumstances, and this must include all the circumstances.

If cybernetics is the science of control, management is the profession of control

The problem with managing either a business or a prison by periodic rather than continuous inspection is that the "variables" are likely to be seriously out of control before the discrepancy is noted.