Enough knowledge for you to pass your PMP, Chris........ BUT, certainly NOT
enough knowledge or understanding to be able to implement what you
learned.....
The problem with the credibility of the PMP lies in the fact that people
pass the exam but don't actually know or understand how to USE SPC or
Shewhart/Deming's teachings to help us better manage our projects....
BR,
Dr. PDG, Dubai, UAE
-----Original Message-----
From: pmhub@googlegroups.com [mailto:pmhub@googlegroups.com] On Behalf Of
Chris
Sent: Sunday, November 28, 2010 15:49
To: PMHUB - The largest PM group in Googlegroups!
Subject: Re: PMHUB-G Control Limits, predefined by Definition?
Hi Paul,
thanks for your answer. Although it does not answer my
question completely the link is a very nice help for understanding
parameters of normal ditributions.
Regarding my question I have done more internet research and
came to the following conclusion:
In general control limits are chosen as +/- 3 sigma, also PMBOK
Guide uses this definition. This is based on the widely used
control chart by Walter A. Shewhart. Other control charts exist
with different control limits (see
http://en.wikipedia.org/wiki/Control_chart).
At the end the control chart in PMBOK Guide is a correct
example of a control chart but shows different control limits than
mentioned in the glossary.
Best regards
Chris
On 27 Nov., 18:37, "Paul D. Giammalvo" <pauldg...@gmail.com> wrote:
> Control limits are a calculated value based on the underlying data. It is
> +/- 3 Standard Deviations from the mean and while the definition doesn't
> change (always +/- 3 sigma) the actual distance from the mean will change,
> depending on what the value of each sigma is.
>
> I am in the Lagos, Nigeria airport right now and don't have access to my
> latest PMBOK Guide to check the picture, but Google on Z
tableshttp://davidmlane.com/hyperstat/z_table.htmland you can start to get
an
> idea that as the value of the standard deviations increases, the shape of
> the normal distribution will change. (Flatten out and spread wider at the
> sigma increases)
>
> BR,
> Dr. PDG, Lagos, Nigeriahttp://www.build-project-management-competency.com
>
>
>
> -----Original Message-----
> From: pmhub@googlegroups.com [mailto:pmhub@googlegroups.com] On Behalf Of
>
> Chris
> Sent: Saturday, November 27, 2010 23:10
> To: PMHUB - The largest PM group in Googlegroups!
> Subject: PMHUB-G Control Limits, predefined by Definition?
>
> Hi all,
>
> I am wondering about whether the wording "control limits" means a
> specific deviation from mean.
>
> See PMBOK Guide p.430:
> "Control Limits. The area composed of three standard deviations
> oneither side of the centerline."
>
> Does this mean, that my upper and lower contorl limits have always the
> same distance from mean in a control chart?
>
> If yes, is picture on p.196 not correct?
>
> 2 days before Exam and repeating the Glossary :-)
> Chris
>
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