The whole process follows the general step of structured systems analysis and design method, therefore the system was developed more scientifically and stability of the system was improved 整个过程遵循结构化系统分析与设计方法(structuredsystemsanalysisanddesign,简称ssa&d)一般步骤,从而提高了系统开发设计的科学性和系统的稳定性。