It has been abroad for some software development work for the various stages of the statistical results show that during development the share of each session all proportion to the workload of systems analysis: System Design: Programming: module debug: system debugging = 20%: 15%: 20%: 25%: 20%. Thus, programming in only a small proportion of development work, and commissioning work accounts for about half of the entire development effort, so "the system development is the programming," the habit of saying is clearly one-sided. According to statistics, management information systems in three phases, the overall planning and development phase of the workload of the system about the workload of the 2 / 3, and operation and maintenance phase to account for 1 / 3, which shows a management information system is developed, it should attach great importance to the maintenance work to continuously improve the system and fully play its role.<责任编辑：计算机毕业设计网(http://www.xiaoniu168.com)>