【摘要】 本文讨论了管理信息系统开发的主要工具——数据流程图的描述范围及研制过程,提出用自底向上逐步归纳的方法绘制分层数据流程图。文中还运用自底向上逐步归纳的思想,给出了数据字典的编制方法。更多还原

【Abstract】 In the development of MIS, it is customary to use the top-down step by step method to plot the stratified data flow diagram. However, this method is very difficult for system engineer not familiar with management business; A bottom-up step by step induction method is suggested: By assuming that the number of bottom strata is n, the DFD of n is drawn first, then the n-1, n-2, …, until the uppermost one.Detailed procedures in plotting new or old DFD are also given: With the idea described, the problem of uniqueness of data definition is solved in data dictionary compilation by hand.更多还原