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How to calculate the earned schedule?

To be honest I haven't heard about the term Earned Schedule (ES) until today. Before I only knew about the earned value (EV). So what is it? How does it differ from the earned value (is it that the ES is about time, while the EV is about money), and how do you calculate it?
asked 10 years ago by anonymous

1 Answer

The Earned Schedule is not something that is invented by NASA or the DOD, but rather by an individual (Walt Lipke). The official website is: http://www.earnedschedule.com/

Earned Schedule was created in order to tackle a known problem with Earned Value. See the problem with Earned Value is that tries to tell you how much we are behind or ahead of the schedule (SPI > 0 or < 0) by comparing actual costs with budgeted costs, which sometimes doesn't make sense, and is often not accurate. Earned Schedule was there to solve this problem, by focusing on the schedule rather than the cost.

You can use the official calculator to calculate the ES, it's available here: http://www.earnedschedule.com/Calculator.shtml

Note that the term Earned Schedule does not exist in the PMBOK nor in any official Project Management publication. It is a proprietary, non-tested, non-proven concept, so be careful when you use it, and maybe it's probably better to stick with EVM.
answered 10 years ago by anonymous

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