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).
功能约束图由两部分组成：时间约束图和功能权值。
Functional constraint graph is composed of the time constraint graph and the function weight.
功能约束图由两部分组成：时间约束图和功能权值。
Functional constraint graph is composed of the time constraint graph and the function weight.
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