策略模式定义了一系列的算法，并将每一个算法封装起来，而且使它们还可以相互替换。策略模式让算法独立于使用它的客户而独立变化。（原文：The Strategy Pattern defines a family of algorithms,encapsulates each one,and makes them interchangeable. Strategy lets the algorithm vary independently from clients that use it.）
Introduction / ITIL v.3 Fundamentals of service strategy Basic concepts of service strategy Processes and roles established by service strategy Example of a workflow during design of a service strategy Conclusion
