每一个迭代都包括需求、分析、设计、实现和测试活动。
Each iteration includes requirements, analysis, design, implementation and testing activities.
其他常见来源包括需求文档、现有的数据词典和遗留解决方案。
Other common sources include requirements documents, existing data dictionaries, and even legacy solutions.
图1表现了一个项目团队需要满足的期望，包括需求和许多其它的。
Figure 1 shows the expectations that a project team needs to fulfill, including requirements and many others.
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