序列用于定义对象的次序，比如机构中人员角色的层次结构。
Sequences support a defined sequence for an object, such as the hierarchy of a person's role within in an organization.
假设有这样一种情况，在交付任意的工作之前有多种检查的层次；因此不同的角色会使用多种流程。
Assume a case where, there are multiple levels of check before delivering any work; hence there are multiple streams which are owned by different roles.
你不得不假设，客户在其自身的任务角色中，希望在可能的最高层次上完成任务。
You have to assume that, in their own job roles, your customers want to perform at their highest possible levels.
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