Definition: Variance at Completion (VAC) is a key performance indicator in project management used to determine the difference between the final planned budget and the expected costs at the completion of a project.
It is calculated by subtracting the Budget at Completion (BAC) from the Estimate at Completion (EAC). VAC is an important metric to assess whether the project is expected to be completed within the originally allocated budget or if it will exceed it.
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