Waterfall Model The linear life cycle model with feedback(反馈)loops Requirements The waterfall model cannot show the order of events Analysis Design 这是一种理想化的开 发过程，实际的软件 开发过程是曲折的。 Implementation Development MaintenanceSlide 2.9 9/50 Waterfall Model The linear life cycle model with feedback(反馈) loops The waterfall model cannot show the order of events 这是一种理想化的开 发过程，实际的软件 开发过程是曲折的