But the budget has grown to be far more than a financial tool. It is, above all, a managerial tool. It is the tool around which an experienced manager organizes all planning. It is the best tool for making sure that key resources, and especially the resource of performing people, are assigned to priorities and to results. It is equally a tool of integration for the entire work force, and especially a tool of integration for the managers in the organization. And it is a tool that enables the manager to know when to review and revise the plans, either because results are different from what is expected - whether better or worse - or because environment, economic conditions, market conditions, or technologies have changed and no longer correspond to the assumptions of the budget.