If you are not preparing monthly variance reports ( how much your actual expenses and income differ from what you projected) you should. 如果你每个月还没做差异报告(你的实际支出和你的预测相差值),你应该马上做。
Variance reports on financial, sales and production plans are ex-amples of information systems oriented to control. 对财务、销售和生产计划的误差报告属于控制型信息系统。