## Reply: Is A Project Ahead Of Schedule When It Has An SPI

 Name E-mail Your e-mail address will never be displayed on the site. Subject Message [quote="Sven Gruendahl" post=4258]Hi John, regarding the PMBOK fifth edition on page 89 you will find a general description regarding Schedule Forcasts: The schedule forcasts are derived from progess [u]against the schedule baseline [/u]and computed time estimate to complete ([b]ETC[/b]). This is typically expressed in terms of schedule variance [b](SV) [/b]and schedule performance index ([b]SPI)[/b] On page 149 in the PMBOK it is described that: Schedule performance measurements such as schedule variance ([b]SV[/b]) and schedule perfomance index ([b]SPI[/b]) used [u]to assess the magnitute of variation to the original schedule basline[/u]. So I already here it is described that you [u]compare project progress [/u]against the basline. (your original plan) and the result should be from a logical point of view: Behind of what you have planned Exactly of what you have planned Ahead of what you have planned Earned Value Management is just putting this into a formular. On page 219 in the PMBOK it is described that: [b]SPI= EV/PV[/b] So if Earned Value is greater than what you have planned (PV) it is positiv and the other way around negativ. The PMBOK decribes: An SPI value [u]less than [b]1.0[/b] [/u]indicates less work was completed than was planned. An SPI [u]greater than [b]1.0[/b][/u] indicates that more work was completed than was planned. OK that was a long way to come to your question but now I come to the point :cheer: Interesting is that the PMBOK describes the place after the decimal point with one number --> 1[b].0[/b] and not 1[b].00[/b]. So from my point of view you need to round the SPI from 1.02 to [b]1.0[/b] and the PM is correct the project is on schedule! I think this question is really tricky and I would not worry too much about these kind of questions. In my PMP exam the questions came across really clear and there was no room for interpretation. I hope you are happy with the answer ;) Cheers Sven[/quote]

## Topic History of : Is A Project Ahead Of Schedule When It Has An SPI

Max. showing the last 6 posts - (Last post first)
8 years 5 months ago #4383

Sven Gruendahl

Here is the answer from PMI. I posted it as a seperate topic in this forum:

www.project-management-prepcast.com/inde...nt-of-the-pmbok#4382
8 years 6 months ago #4287

John Feist

Hi Guys,

Thanks for all the responses. My concern is more about getting some of us students perplexed as I recognize that hitting an exact 1.0 on CPI or SPI is almost impossible without some kind of confidence interval. Unfortunately, there are several other questions out there (and I was too lazy to write down the numbers) where they provide similar scenarios (e.g. an index that is less than .05 +- from 1.0) where the correct answer is that the project is not on budget/schedule.

I'm curious to see what PMI has to say.

:{)
8 years 6 months ago #4286

Sven Gruendahl

Nothing new yet. As I wrote already above I will post an answer from PMI if I get one.
I wrote to customercare and do not have other contact persons. So I gues this will take some weeks due to the priority....
8 years 6 months ago #4284

Markus Kopko, PMP

Sven Gruendahl wrote: Markus,
....

There must be a reason behind that and I am really curious to find out what PMI's opinon is.
Maybe I am too curious but I have send PMI a mail and just asked them.
I keep you posted!!

Cheers
Sven

Anything new yet?

btw: since every post maid herein has first to be moderated bevor publishing it, i think i am missing 2,3 posts i have made the last few days?!?
but may be, since i am active on a lot of websites/boards, that is just a wrong feeling by my owne ... ^^
8 years 6 months ago #4274

Kevin Reilly

Hi John -

Excellent post! As a PMP Exam Prep Trainer by trade and also a creator of questions for the OSP International PM Exam Simulator, I can offer you the following interpretation and also what I tell my PMP Exam Prep students in my live classes.

If the SPI is "greater than" 1.0, your project is "ahead of schedule"

If the SPI is "less than" 1.0, your project is behind schedule

I the SPI is "exactly" 1.0, your project is "exactly on schedule"

In my project experience if your SPI is “exactly” 1.0 then you are lying!!! (Seriously though, how often is your project "exactly on schedule"?)

And just so you know, this question was intentionally very tricky so that you understand the concepts of the SPI and what the different calculated results mean on your actual projects.

If you stick to the interpretations of the SPI calculated results outlined above when answering exam questions and on your actual real-life projects, you will understand specifically how to interpret and accurately report these results to your project stakeholders.

Thanks for a great question and entertaining forum topic!

Kevin

Kevin W. Reilly, PMP, PMI-ACP
Customer Support
OSP International LLC
8 years 6 months ago #4270

Markus Kopko, PMP

Sven Gruendahl wrote:
...

But why do they print 1.0 instead of 1.000000 in the PMBOK ?
(because out of this I came to the conclusion that it must be rounding)
Why do they not just print 1?

There must be a reason behind that and I am really curious to find out what PMI's opinon is.
Maybe I am too curious but I have send PMI a mail and just asked them.
I keep you posted!!

Cheers
Sven

Hi Sven,

if i have to guess, why they didn't print just "1" in the PMBOK Guide ...hmmm, my choice would be, because the SPI also could be under "1" or "1.0" ... just like ..."0.96" .... see it?!

Regarding the "rounding theory" (that was my point, John) ... hmmm, let's just look at the example above, a SPI of "0.96".
Following the rounding theory we have to round up the SPI in this case up to "1", right?

Well, this would really not be right, right?

I am exited to read what PMI has to say about it.

Best regards,

Markus

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