Estimate-at-completion (EAC)
Estimate-at-completion (EAC) is forecasting the final stage of the project. The advantage is that the cost forecast is hardly influenced by changes in the actual costs or the budget. Therefore, you do not have to register frequently and still be accurate. To calculate the variance-at-completion (VAC), at least one valid registered cost forecast is required for each piece of budgeted work in the project scope.