fbpx
Do you need customer support or technical assistance? Click here to submit a support ticket...

TOPIC: Relation between CPI and TCPI

Relation between CPI and TCPI 4 years 5 months ago #10217

  • Anurag Singh
  • Anurag Singh's Avatar Topic Author
  • Offline
  • Fresh Boarder
  • Fresh Boarder
  • Posts: 1
  • Thank you received: 0
Hi,

I want to start a thread for discussing relation between CPI and TCPI. I came across an exam question where I was asked to demonstrate relation between CPI and TCPI. So the question goes if the project is 50% complete and current CPI is 0.75. What is the TCPI? According to my calculations which I am demonstrating below the answer comes out to be 1.51 but the correct answer is 1.25. Attached is the discussion paper as well.

My Answer:
Since project is 50% complete EV = 0.5 * BAC

CPI = 0.75 => AC = (EV/0.75) = (0.5 * BAC)/(0.75) = 0.67 * BAC

TCPI = (BAC-EV)/(BAC-AC) = (BAC - 0.5 * BAC)/(BAC - 0.67 * BAC) = 1.51


This browser does not support PDFs. Please download the PDF to view it: Download PDF.
Attachments:

Relation between CPI and TCPI 4 years 2 months ago #10987

  • Tom Robbrecht
  • Tom Robbrecht's Avatar
  • Offline
  • Fresh Boarder
  • Fresh Boarder
  • Posts: 6
  • Karma: 1
  • Thank you received: 1
I came across this thread when researching EVM and decided to revive it as a distraction from studying for a few minutes.

I believe the paper you're referring to may have used confusing terminology.
I believe what is meant with "50% complete" is actually "50% funds spent" (AC/BAC).
In that case a CPI of 1,25 would make sense: if your project was underperforming by 25% (CPI 0,75) for the first half of the budget, it should overperform by 25% for the remaining half of the budget in order to stay within the BAC.

More conventionlally, if you consider "50% complete" to be "half the work done" (EV/BAC), then your project was underperforming by 25% during half of the work, which means you've spent 0,5/0,75 = 67% or 2/3 of your funds, therefore your funds remaining are 1/3 of BAC.
TCPI=(work remaining)/(remaining funds) = 0,5/0,33 = 1,5
So, in order to keep your project within initial budget you'll need to overperform by 50% for the remaining 50% of the work.
Last edit: by Tom Robbrecht.
Moderators: Yolanda MabutasMary Kathrine PaduaGabriella Dellino, PMPJoe PangJohn Paul BugarinEmily Rivera, PMPLisa Sweeney PMPHarry ElstonMani SelvanDenver MartinEric Wanyutu Kahiga, PMP, PMI-ACPSarah FucciThiago França, PMP®Felix Kamanga, PMPChan RampersaudElena MekhanoshinaKyle Kilbride, PMP

OSP INTERNATIONAL LLC
OSP INTERNATIONAL LLC
Training for Project Management Professional (PMP)®, PMI Agile Certified Practitioner (PMI-ACP)®, and Certified Associate in Project Management (CAPM)®

Login