Topic 11.4: PV / EV / AC example
Our project scope is to build a four-sided fence, and the following WBS with schedule has been approved:
On Monday we will build the North face, Tuesday the East face, Wednesday the West and Thursday the South.
As a result of our detailed planning, we have also estimated that it will cost $2,000 in total for materials and $500 per day for labour.
Let’s add that information in…
As you can see, the planned value is expressed cumulatively as the project progresses. In other words, we planned to have spent:
$2,500 by the end of day 1
$3,000 by the end of day 2
$3,500 by day 3, and
$4,000 by the completion of the project.
If we were to plot this information on a chart, we would see that the planned value of the project follows a defined trajectory that aligns with this cumulative expression of value.
Now let’s suppose that on Monday we completed all of the north side of the fence and half of the east side of the fence.
We were also able to secure a 10% discount on the materials.
What would our PV, EV and AC be now?
First of all, let’s update our Gantt chart.
Here is the where we are now, the end of Monday (the green line); and here is the work we have completed (the yellow blocks).
Our planned value does not change – this is our baseline figure.
We have nevertheless earned $2,750 worth of value.
Do you see where that has come from?
We have completed the work we planned for Monday, which was valued at $2,500, and we have also completed half the work we planned for Tuesday.
The planned value of Tuesday’s work was $250, so adding this to the work completed on Monday gives us a total earned value of $2,750.
Our actual costs, however, are different again.
Remember we received a 10% discount on our materials, so we only actually spent $1,800 on them.
We also only paid for one day’s labour – even though we got one-and-a-half days’ work done – so our actual cost of labour was $500.
$1,800 plus $500 gives us an actual cost at the end of Monday of $2,300.
Our EVM chart can also be updated accordingly:
Make sure that you can fully follow this example before moving on, as these numbers will inform the next few topics as well…