单项选择题 （）from one phase are usually reviewed for completeness and accuracy and approved before work starts on the next phase.

单项选择题 （）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.

单项选择题 （）is the budgeted amount for the work actually completed on the schedule activity or WBS component during a given time period.