对于项目开发中需要完成的各项工作，从需求分析、设计、实现、测试直到维护，包括文件的编制、审批、打印、分发工作，用户培训工作，软件安装工作等，按层次进行分解，指明每项任务的负责人和参加人员。-for project development needed to complete the work, from needs analysis, design, implementation, testing until maintenance, including document preparation, processing, printing, distribution, user training, software installation, according to levels of decomposition. specified for each task and the responsibility of the participants.