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George,
if the 96.5% is an accum SPI against the baseline which you feel is realistic (and you done already done a resonable amount of work to make the numbers real)
and
you have looked at the top 5 critical paths and everyboby working on todays critcal activities is fully aware and committed to delivering them on time
and
the Float Trend Analysis looks OK
and
your not counting out of sequence progress
and
the programme is suddenly not calling for a step change in performance
then go on, take them out for a drink and put it on expenses. Youll need the Quodos when the going gets tough !
Pay attention.
There are not vitual limit to the SPI value.
At the end of the project it will be always 1.00 (as you will have performed all the scope)
It is "valid" between the 15 and 75% of the project progress
When the project is <15% there are not enought data to have a statistical meanfull population for EV when progress>75% it tends to 1.00.
Been SPI = Earned / planned
you may have performed activity out of sequence and Earned a value bigger than the planned thanks to non critical activity.
It will give you a SPI >1.00 but if you miss a critical activity your project may be in delay.
Hope this help
Ive got a 96.5% SPI overall total as of this week. Is there any range of tolerance by how much can we say the progress is OK and not and alarming, i mean what is the maximum SPI value we are allowed to achieve.
If its CPI:
BCWP (EV) / ACWP (Actual Cost of Work Performed)
If its SPI:
BCWP/BCWS
Hope this helps!