If sophisticated calculations are needed to justify an action, don't do it.
The first myth of management is that it exists. The second myth of management is that success equals skill.
Things have to be made to happen in a way you want them to happen. Without management, without the intervention of organized willpower the desired result simply cannot be obtained.
The first myth of management is that it exists.
If you are attempting the impossible, you will fail.
Effective management always means asking the right question.