CSM Forum Banner

Control Chart Question

Discuss PMP doubts, tips and lesson learned. iZenBridge makes PMP® Certification easy
nagarwal
Participant
Participant
Posts: 60
Joined: Sun Jun 22, 2014 8:34 am

Control Chart Question

Postby nagarwal Sat Aug 30, 2014 7:49 am

You are producing aluminium dowels. The control limits of this production process are 14.9cm and 15.1cm. The specification limits are 14.8cm and 15.2cm. Inspection shows that the last 5 dowels produced are 15.2cm long. What do you do?
A.) Deliver them to the customer.
B.) Don’t’ deliver them to the customer.
C.) The process is out of control and needs to be adjusted.
D.) You should not be inspecting because you have clear control and specification limits.
signor_rk
Contributor
Contributor
Posts: 182
Joined: Wed Jun 18, 2014 3:47 pm

Re: Control Chart Question

Postby signor_rk Sat Aug 30, 2014 8:43 am

Option # A. Deliver them to the customer.
Since the upper specification limit provided by the Customer is 15.2 cm , the last aluminium dowels produced with 15.2 cm long have no problem with Customer's specification limit. So it can be delivered without any hesitation.
Regards ,

Ranjit
nagarwal
Participant
Participant
Posts: 60
Joined: Sun Jun 22, 2014 8:34 am

Re: Control Chart Question

Postby nagarwal Mon Sep 01, 2014 3:35 pm

But isn't the process out of control here. Since the reading here are outside the control limits. And as per Rita, the Project manager should investigate if a reading is outside the control limit.
signor_rk
Contributor
Contributor
Posts: 182
Joined: Wed Jun 18, 2014 3:47 pm

Re: Control Chart Question

Postby signor_rk Mon Sep 01, 2014 5:19 pm

Customer's requirement should be given the TOP most priority , what I know so far.
Regards ,

Ranjit
namita
Super Member
Super Member
Posts: 502
Joined: Wed Dec 11, 2013 10:25 am

Re: Control Chart Question

Postby namita Tue Sep 02, 2014 7:37 am

Even one point out of control limit is considered as uncontrolled process. It should be C

As per PMBOK 5

A process is considered out of control when: (1) a data point exceeds a control limit; (2) seven consecutive plot points are above the mean; or (3) seven consecutive plot points are below the mean
nagarwal
Participant
Participant
Posts: 60
Joined: Sun Jun 22, 2014 8:34 am

Re: Control Chart Question

Postby nagarwal Tue Sep 02, 2014 10:38 am

Thanks Namita. Thanks for clarifying. It's of great help.

Return to “PMP® Open Forum”

Who is online

Users browsing this forum: No registered users and 9 guests