PPM对项进行分组、观察、分析和管理，以确保在组织资源约束的情况下最大化实际的业务结果。
PPM groups, views, analyzes, and manages projects together to maximize positive business results within an organization's resource constraints.
约束被分组到具有分层结构的目录中。
Constraints are grouped into hierarchically structured categories. A constraint category defines the following attributes.
定义约束的一个子集，以根据用例对其分组(用户是有效的，而且用户在一次点击中提供了足够的信息)。
Defining a subset of constraints to group them by use cases (the user is valid and has provided enough information to buy in one click).
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