The Formula to calculate the Productivity, based in the Earned Value Method or EVM, is : P = %Complete x Budget Manhours / Actual manhours, so, you first need the Total Budgeted Manhours, then the Actual % complete, thta must be calculated as the actual Quantity of work done divided by the total work in the Budget, then you'll need the Actual manhours expended in the execution of the actual work, to put those Manhours in the denominator of the above formula. This way you will have the P or Productivity of that activity. Now, the Earned Value is in the Numerator of the Formula I gave above = % Complete x (times), the Total Budget Manhours, meaning the % of Hours you should have spent compared to the total budget, OK? Tell me if you need to see a simple sample. Hope this helps