All joking aside, with the emphasis placed on EVM's benefits, you may be inclined (or coerced) to apply it to your next project. To help you avoid some of the more common beginner pitfalls with use of EVM practices, here are three tips:
- Consistent progress reporting on tasks or work packages is crucial. If you do not set expectations about standards for progress reporting across your project work packages (or even worse, in a portfolio/program situation, across the different projects that you are overseeing), rolled up value calculations will magnify these inconsistencies. Whether you want to be a purist and accept only 0 or 100% (good luck "selling" that in most organizations!) or see the world in a few limited shades of grey (0, 25, 75, 100%), ensure that there is consistent progress reporting to ensure that you can do an "apples to apples" comparison between project, sub-projects, or work packages.
- Be aware of non-critical paths. If you have team members that are neglecting critical path activities but have completed multiple high value non-critical path activities, you could end up with favorable schedule variance calculations even though you are behind on the critical path. I recall a project where team members spent a significant amount of time on non-critical path work packages and the project manager reported favorable schedule performance far past the point where the end date was in serious jeopardy. This is where you may want to consider doing a separate set of earned value calculations focused on critical path activities or at least do not use schedule variance as the sole metric for evaluating schedule performance.
- Be aware of cost imbalances between one-time costs (e.g. capital expenditures) and ongoing costs (e.g. labour or consulting fees). Similar to the previous point, if one time costs occur earlier or later than originally planned, cumulative cost data could negatively impact the accuracy of variance calculations. Variances in these one-time costs can also "mask" performance issues. If a computer server is much cheaper than was originally budgeted, the cost savings could hide poor labour productivity or performance on another work package. As much as possible, separate one time costs so that you can get a more accurate performance picture.
Earned Value Management IS a recognized best practice for objectively assessing project cost and schedule performance, but, as Ben Parker would say, "With great power comes great responsibility."