为执行建模并不是一个新概念，因为这种方式已经在传统的软件和系统开发中被用了有一些时间了。
Modeling for execution is not a new concept, as this approach has been used in traditional software and system development for a while.
请记住，需要对项目活动进行迭代；传统的瀑布式系统开发方法的风险经常要高得多，特别对于大型的复杂项目更是如此。
Keep in mind that the project activities need to be iterative; the traditional waterfall approach to system development is prone to much higher risk, especially for large and complex projects.
传统交付方法以系统开发生命周期为基础，不同的组织负责实现不同的生命周期部分。
Traditional delivery approaches are based on phases of the system development life cycle with different organizations fulfilling a different part of the life cycle.
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