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From my point of view the cost control is very important part of work of any thorough manager. And it is "very simply" :-).
I have a yearly budget divided into twelve period. Every month I need to do check with financial department, if I am still in terms of the budget or not. If yes, no problem then. If I have savings, I can spent them or I can save them for the future. If I am not in the budget, in next period I need to save the missing amount, or use the part of amount save earlier, or to be killed by my boss :-)
Of course it is not so easy, it is really though fight every month. But with a good budget preparation and with regular monthly cost control the successful budget delivery can't be a significant problem.