第四级的简单服务通常会被复合服务替代，后者可以进行组合。
Often the simple services of level four are replaced by composite services that can be choreographed.
你可以从那里开始使用工具来收集和跟踪每日工作进展和沟通数据，并实现到第四级的转变。
From there, you can start using the tool to collect and track daily metrics and trend data, and transition to Level 4.
第四级需要一笔至少累计为9000美元的启用费。
To get to the fourth requires at least a cumulative $9, 000 in activation fees.
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