扩展内容：Naterfall Models理想化的方案 Communication Real projects rarely follow the Project initiation sequential flow. Requirements gathering Customers usually can't Planning state all requirements .Estimating explicitly. Scheduling and tracking A working version will not be available until Modeling late in the project ·Analysis and design time-span. Classic Construction Code and test Life Cycle Deployment ·Delivery Support and feedback Slide 2.10 10/50 扩展内容： Waterfall Models 理想化的方案