在我们继续模型的下一个阶段之前，要满足之前阶段等级的所有需求。
All requirements for the previous stage level must be satisfied before we proceed to the next stage of the model.
在优化阶段修复它们，可以获得你需要的性能等级。
Fixing those during an optimization phase will get you the required levels of performance.
CMMI有五个成熟度阶段或等级：初始过程、可管理的过程、可定义的过程、量化管理过程和优化的过程。
CMMI has five maturity stages or levels: initial process, managed process, defined process, quantitatively managed process and optimized process.
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