A CPI of less than 1 is a cause for concern - it is easy to graph the CPI at each reporting period and see the trend. The same goes for SPI. But being a ratio it really tells you nothing. If you want to make management pay attention graph the variance.
A CPI of 0.8 remaining constant month on month will have a corresponding Variance that is increasing every month in proportion to the cumulative EV.
Patrick,
Wasn't trying to comment on EVM methodology or how (un)helpful it us just that the output (of any index) could be more explicit if, when used in isolation you knew WHEN it was calculated and against WHICH CPN programme.
So CPI = 0.8, which might give cause for concern, could be written
P2 of 23
CPI=0.8
ES = 50%
Which conveys much more information with very little effort.
Regards
Peter
Member for
24 years 9 months
Member for24 years9 months
Submitted by Patrick Weaver on Sat, 2022-09-03 08:32
CPI and SPI are both ratios and largely meaningless.
CPI is used to calculate the iEAC, and both can be used to compare (ie, benchmark projects). But, If you want management information the variance provide real information that people can understand.
VAC and VAC% is the headline number and if you bolt on Earned Schedule you get the forecast completion date. Then if you are running a robust EVMS (not playing around with EV in a schedule), you can also highlight the work packages with significant issues. A robust EVMS is not particularly difficult to set up and operate based on the ISO 21508 approach and should produce information that is very easy to understand and act on.
An EVMS is a performance management system, set up properly it highlights the performance of managers (good and bad) which provides the opportunity for management assistance where needed. For more on setting up a simple, robust and rigorous EVMS there’s a lot of free to use information at: https://mosaicprojects.com.au/PMKI-SCH-040.php#Overview
CPI and SPI are both ratios and largely meaningless.
CPI is used to calculate the iEAC, and both can be used to compare (ie, benchmark projects). But, If you want management information the variance provide real information that people can understand.
VAC and VAC% is the headline number and if you bolt on Earned Schedule you get the forecast completion date. Then if you are running a robust EVMS (not playing around with EV in a schedule), you can also highlight the work packages with significant issues. A robust EVMS is not particularly difficult to set up and operate based on the ISO 21508 approach and should produce information that is very easy to understand and act on.
An EVMS is a performance management system, set up properly it highlights the performance of managers (good and bad) which provides the opportunity for management assistance where needed. For more on setting up a simple, robust and rigorous EVMS there’s a lot of free to use information at: https://mosaicprojects.com.au/PMKI-SCH-040.php#Overview
Member for
24 years 9 monthsHi Peter,A CPI of less than 1
Hi Peter,
A CPI of less than 1 is a cause for concern - it is easy to graph the CPI at each reporting period and see the trend. The same goes for SPI. But being a ratio it really tells you nothing. If you want to make management pay attention graph the variance.
A CPI of 0.8 remaining constant month on month will have a corresponding Variance that is increasing every month in proportion to the cumulative EV.
This is a core element in the effective communication chapter in my book Easy EVM: https://mosaicprojects.com.au/shop-easy-evm.php
Member for
20 years 5 monthsHi, come on you software
Hi, come on you software gurus.
Still looking for a way to display superscript and subscript on the same gaphic line for excel/word use.
P3 of 20
like SPI=0.95
ES=66%
It must be done for intergral calculus
Peter
Member for
20 years 5 monthsPatrick, Wasn't trying to
Patrick,
Wasn't trying to comment on EVM methodology or how (un)helpful it us just that the output (of any index) could be more explicit if, when used in isolation you knew WHEN it was calculated and against WHICH CPN programme.
So CPI = 0.8, which might give cause for concern, could be written
P2 of 23
CPI=0.8
ES = 50%
Which conveys much more information with very little effort.
Regards
Peter
Member for
24 years 9 monthsCPI and SPI are both ratios
CPI and SPI are both ratios and largely meaningless.
CPI is used to calculate the iEAC, and both can be used to compare (ie, benchmark projects). But, If you want management information the variance provide real information that people can understand.
VAC and VAC% is the headline number and if you bolt on Earned Schedule you get the forecast completion date. Then if you are running a robust EVMS (not playing around with EV in a schedule), you can also highlight the work packages with significant issues. A robust EVMS is not particularly difficult to set up and operate based on the ISO 21508 approach and should produce information that is very easy to understand and act on.
An EVMS is a performance management system, set up properly it highlights the performance of managers (good and bad) which provides the opportunity for management assistance where needed. For more on setting up a simple, robust and rigorous EVMS there’s a lot of free to use information at: https://mosaicprojects.com.au/PMKI-SCH-040.php#Overview
[[wysiwyg_imageupload:8198:]]
Or you can buy my book Easy EVM for $35: https://mosaicprojects.com.au/shop-Easy_e-Books.php
Member for
24 years 9 monthsCPI and SPI are both ratios
CPI and SPI are both ratios and largely meaningless.
CPI is used to calculate the iEAC, and both can be used to compare (ie, benchmark projects). But, If you want management information the variance provide real information that people can understand.
VAC and VAC% is the headline number and if you bolt on Earned Schedule you get the forecast completion date. Then if you are running a robust EVMS (not playing around with EV in a schedule), you can also highlight the work packages with significant issues. A robust EVMS is not particularly difficult to set up and operate based on the ISO 21508 approach and should produce information that is very easy to understand and act on.
An EVMS is a performance management system, set up properly it highlights the performance of managers (good and bad) which provides the opportunity for management assistance where needed. For more on setting up a simple, robust and rigorous EVMS there’s a lot of free to use information at: https://mosaicprojects.com.au/PMKI-SCH-040.php#Overview
[[wysiwyg_imageupload:8198:]]
Or you can buy my book Easy EVM for $35: https://mosaicprojects.com.au/shop-Easy_e-Books.php