Earned Value Technique
Category : Project Management
Learn about Earned Value Technique in this video.
Earned Value Technique is an excellent way to track the Project Progress against the Project Plan. It's a method of objectively measuring project performance against the Project baseline. Result from an Earned Value analysis indicate deviation of the Project from cost and schedule baselines.
Let me quickly ask you what is a Baseline? I have already explained this earlier..but just to provide a quick recap baseline means first approved value. So schedule baseline means 'The First Approved Project Schedule'.
There are various terms used in Earned Value Techniques. All these terms are listed on this slide. Please go through the same. They are quite self explanatory. For example, PV or Planned Value, is the Estimated Value of the Work Planned to be done. This value is measured in terms of currency, say dollar. So, if planned value is $340, it was planned that $340 worth of work was to be done.
But, how do you calculate Earned Value? It's quite simple. Just add the budget allocated to each of the activities that have completed at that point in time. The resulting value is Earned Value at point of time.
All other parameters listed in this slide are also measured in terms of currency only.
Earned Value Formulas
Now that you have gone through the Earned Value Terms, Let's look at the formulas involved in calculating the Earned Value.
Here again, all the formulas are listed in the slide along with their explanation. Remember to note that Negative cost variance means that the project is over budget, positive means the project is under budget.
Similarly, Negative schedule variance means that project is behind schedule where as Positive schedule variance means that project is ahead of schedule.
The next two parameters i.e. Cost Performance Index (CPI) and Schedule Performance Index (SPI) are also quiet important parameters. Their value varies between 0 and 1.
So, if CPI is say 0.8, it means that we are getting 80 cent out of every dollar spent in the Project.
If, SPI is say 0.9, it means that project is progressing at only 90% of the speed originally planned.
The next parameter is Estimate At Completion. So, at any point of time during the project execution, if it is required to know how much the project would actually cost by the time its gets completed, just divide the Budget At Completion by the Cost Performance Index.
What is Budget At Completion? It's simply the Budget of the Total Project.
The next parameter is Estimate to Complete, which is how much more would the project cost from this point onwards. This is calculated simply by subtracting Actual Cost from the Estimate at Completion.
Also, Variance at Completion can be calculated by subtracting Estimate At Completion from the Budget At Completion.
Earned Value Problem Example
Let's take the example of a Software development Project. The Project has four phases as shown on the slide. Each phase is budgeted to cost $10,000. Time estimate for each phase is one month. The total project duration is 4 months. The phases are sequential, i.e. they occur one after the other.
Today is the end of third month; calculate the CPI and SPI of this project!!
Now, as you can see in the slide, at the end of the 3rd month, the status of the Project is:
- First Phase, i.e. Requirement definition of the project is completed within the planned time and budget.
- Second phase of architecture & design was planned to get over by the end of 2nd month, but it actually gets completed by 3rd month. It costed $12,000 instead of $10,000 to get completed.
- Third phase, ie Development and Unit Testing is only 50% done, thought it was supposed to get completed by the end of the 3rd month. It costed $9,000 instead of $5,000 to get completed.
- Work on fourth phase ie System Testing & Go live has not yet started and it was not even planned to get started.
Earned Value Problem Solution
To calculate the Planned Value, PV, you just need to add the amount of work that was supposed to be done by 3rd month. Three phases of the project were supposed to be completed by the end of third month. The budget to complete each of the three phases was $10,000.
So the planned value, PV, is $10,000+$10,000+$10,000= $30,000
But, what is actually done by 3rd month is, two of the project phases are completed and the third phase is only 50% done, hence the Earned Value, EV is $10,000+$10,000+$5,000=$25,000
The actual cost, AC, of doing the work is $10,000+$12,000+$9,000= $31,000
Now, since we know, PV, EV and AC calculating CPI and SPI is pretty straight forward. Just put these into the formulas we learnt earlier.
Do this as an exercise!