单项选择题 Configuration management system can be used in defining approval levels for authorizing changes and providing a method to validate approved changes.（）is not a project configuration management tool.

单项选择题 Changes may be requested by any stakeholder involved with the project, but changes can be authorized only by（）

单项选择题 Many useful tools and techniques are used in developing schedule（）is a schedule network analysis technique that modifies the project schedule to account for limited resource.