During the project, requirements change for a variety of reasons. As needs change and as work proceeds, additional requirements are derived and changes may have to be made to the existing requirements. It is essential to manage these additions and changes efficiently and effectively. To effectively analyze the impact of the changes, it is necessary that the source of each requirement is known and the rationale for any change is documented. The project manager may, however, want to track appropriate measures of requirements volatility to judge whether new or revised（）are necessary.
（） are individuals and organizations that are actively involved in the project, or whose interests may be affected as a result of project execution or project completion; they may also exert influence over the project and its results.
（） are individuals and organizations that are actively involved in the project, or whose interests may be affected as a result of project execution or project completion.
（） are individuals and organizations that are actively involved in the project, or whose interests may be affected as a result of project execution or project completion.
（）involves comparing actual or planned project practices to those of other projects to generate ideas for improvement and to provide a basis by which to measure performance. These other projects can be within the performing organization or outside of it, and can be within the same or in another application area.
（）is the budgeted amount for the work actually completed on the schedule activity or WBS component during a given time period.
（）is the budgeted amount for the work actually completed on the schedule activity or WBS component during a giving time period.
The（）technique involves using project characteristics in a mathematical model to predict total project cost. Models can be simple or complex.
In the process of communication requirement analysis, the project manager should consider the number of potential communication channels or paths as an indicator of the complexity of a project's communication. According to Metcalfe's Law, a project with 10 stakeholders has（）potential communication channels.
A project life cycle is a collection of generally sequential project（）(1) whose name and number are determined by the control needs of the organization or organizations involved in the project. The life cycle provides the basic （）(2) for managing the project, regardless of the specific work involved.
空白（1）处应选择（）A project life cycle is a collection of generally sequential project（）(1) whose name and number are determined by the control needs of the organization or organizations involved in the project. The life cycle provides the basic （）(2) for managing the project, regardless of the specific work involved.
Project selection methods involve measuring value or attractiveness to the project owner or sponsor and may include other organizational decision criteria （）is not a project selection method.
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