扩展：与适应周期性负载相比，升级容量是更常见的扩展情况。
Scaling: Upgrading capacity is a more common case of scaling than is accommodation of cyclical loads.
成功项目的关键是通过清晰地定义需求来管理变化，并在解决方案开发周期中根据需求适应变化。
The key to a successful project is to manage change by clearly defining the requirements and to adapt them as needed over the solution development cycle.
最终，它使软件生命周期可以适应按需企业的需要，因为它们通过针对业务灵活性重新设计IT流程来寻求更高的有效性。
Finally, it supports a software life cycle to fit the needs of on demand enterprises as they seek increased profitability by reengineering it processes for business agility.
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