After the planning is completed, the implementation of the project starts—-carrying out the plan that was previously developed.
Ideally, projects are implemented exactly as planned, but this is seldom the case.
But sometimes this approach might be fine when the actual work and cost values generated are close enough to your baseline schedule. The project marks the task as 100% complete and updates the Work column to 24 hours (from initial 16 hours).
In the example, a Baseline is saved, because the Baseline does not change and is used as a comparison.
Properly tracking actual work and comparing it against the original plan enables you to identify variance early and adjust the remaining portion of the plan when necessary.