当团队需要用户故事的时候，我们会采用价值最高的过程，然后针对团队的需要以正确的粒度将其分解为用户故事。
When the team needs user stories, we take the highest value processes and break them down into user stories at the right level of granularity for the team's needs.
行为规则(有时候也称为操作规则)可以进一步分解，从而根据过程实现的粒度支持不同的实现模式。
A behavioral (sometime also named operative) rule can be further decomposed to support different patterns of implementation depending on the granularity of the process implementation.
藉由这个新的接口，开发人员可以实现service异步调用过程中的细粒度通知，但它并没有提供Callback类中的轮询机制。
This new interface allows for finer grained notifications during the asynchronous invocation of a service, but it does not provide the polling mechanism formerly found in the Callback class.
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