How can we integrate Schedule Performance Index and Actual delay or ahead?
Schedule Perfomance Index
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SPI is a good measure of actual performance. (Though I prefer to use SV myself, since this doesn't have the flaw of naturally trending towards 1)
In my opinion it is less reliable as a predictor of future performance, unless you a working on a very repeatable project like a pipeline.
It is certainly not a good way to predict project completion, since it takes no account of critical path or schedule risk.
Hi Gary;
Thank you for your reply.
As you mentioned , if we can not rely on the SPI for the delay analysis, what is the purpose to calculate the SPI??
Senthuran
How are you defining "actual delay or ahead"?
If you just mean forecast completion date vs target, I wouldn't integrate them. I have seen people dividing remaining duration by SPI to calculate a projected finish date, but I don't think this is a reliable measure.
If you mean "how much work have we done vs how much we should have done", this is what SPI represents, so no need to integrate it.
If you mean an activity-count or activity-weeks type measure, just use SPI instead as it is a better measure of progress to date.