生鱼片模型 Sashimi Model

生鱼片模型是改进的瀑布模型，有如下的优点和缺点：

Overlapping phases 阶段之间可以重叠

Advantages

Reduces overall schedule

Reduces documentation

Works well if personnel continuity

Disadvantages

Milestones more ambiguous

Progress tracking more difficult 过程跟踪会变得困难

Communication can be more difficult