A baseline allows a user to perform a comparison of how a system is performing.
One element of the project plan is the performance measurement baseline (PMB). It outlines a project's or a project's components' scope, budget, and timetable. By comparing the work's progress to this baseline, the project manager and the stakeholders can see where the project is in terms of time, money, and scope.
An complete project's baseline for performance measurement is often created. Additionally, it is frequently dispersed at a finer level. It can refer to a control account in a work breakdown structure (WBS) that contains one or more work packages or planning packages (source).
The project activities' timetable is defined by the baseline schedule (based e.g. on estimated activity durations and schedule network diagrams).
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