PROCESS CAPABILITY: Explaining Cp, Cpk, Pp, Ppk and HOW TO INTERPRET THOSE RESULTS

Process Capability is an important topic in continuous improvement and quality engineering and in this video, we discuss the basics of process capability, the major indices (Cp, Cpk, Pp, Ppk) and how to interpret those results!

0:50 – An Introduction to Process Capability – Comparing our process against our specifications

2:22 – The Cp Index – measuring the “potential” of your process

4:50 – The Cpk Index – A worked example and Explanation of the equation

6:40 – The Cpk Index – Centering up our process and re-calculating Cpk.


7:35 – The Pp index – Explaining the 2 different methods for calculating the standard deviation, and a discussion around process control

11:20 – The Ppk Index – Looking at the equation, and discussing the standard deviation (again)

11:55 – Interpreting the Results of your Capability Value – the sigma level, % Conforming, DPM (Defects Per Million) and Defect Rate (1 in 10,000??)

Free Black Belt Course:

Free Black Belt Resource:

[hiwajavanmiri]

I passed the CQE exam by using most of your videos last week. Today, when I watch your video again, still I learn and still is great. Thank you ANDY

[matthewcarnovale]

Great stuff Andy. Really appreciated that you highlighted that a process needs to be in control for us to utilize the capability calculations. Count me in as a subscriber.

[aronsweeney]

After 8 months of LSS course work, this brought it all together into a very concise and easy way to keep Cp and Pp straight. Great video!

[victorjimenez]

We use these values at work quite often. I'm still a green process engineers only about 1.5 years in my current role. This video has cleared up what I am actually calculating when analyzing the data collected from the manufacturing trials. I am in awe how much I have learned about my own role and how well you explained this topic.

Thank you.

[Master_Therion]

I suspected that one of our processes was not in statistical control so I told my manager I wanted to collect data to measure Pp. I had to talk to human resources.

[alhassanmohammedawal]

Andy, You are good. i am not in the profession you are discussing but your explanations are very satisfying and easy to follow. Thank You. I fall on you for some statistical explanations.

[narimansarafan]

Honestly, you are a perfect man. Thank you for everything.

Now, I understand these things. Previously, I memorized, but now I understand.

[catch-my-drift]

Wow! Your explanation of process capability is so clear and helpful that now I actually understand it. You have contributed amazing content and quality with this video, thank you!

[enkhbolorphillips]

Hi Sir …I am new leaner it’s so much helping me your explanation of this knowledge better understand my new job …many thanks

[Iamoscarlopez]

Woooow!!! Amazing way to teach man!, you explained me in deep detail very important points no body explain, I Love You, thank you for your Job!

[janicerm]

Your videos are so helpful. I'm taking an Operations course that has no content like this to give context to the equations covered. Thank you!

[travishsu]

I watch this for preparing my interview of the role attribute verification engineer. Thank you sir

[syedaliaskari]

Beautifully explained and very well simplfied, good refresher. Thanks

[xtsspuv]

Thank you Andy for posting this video! I am working on getting my ASQ Six Sigma Green Belt and this video helped make things a bit more clear. Can't wait to watch your other videos.

[saintmo]

Hi and thanks for the video Cp, Cpk, Pp and Ppk are well understood now. Thanks so much

[gianlucappgozzi]

Thank you Andy for the video, people in the factory is asking me when we have to use Ppk and when Cpk. Ciao, Gian Luca

[D.J.]

Great video Andy. Two days ago, I spent over an hour learning Cpk on my own through self study. Had I watched this video first, I would have saved a lot of time. Do you cover statistical formulas this same way in your CSSGB prep course?
Thanks for the great content!

[Boerikoe]

Great straight to the point presentation, clearly explaining the differences... Thank you very much ! Enjoyed every minute of it.

[francoisl]

Very, very good slides and explanation. Thank you

[sundaramsekar]

Excellent presentation. Made me to understand without any difficulty, by simply following your lucid explanation. Thank You. My further request to you is need your similar video on calculating the defects per million (DPM) with any given Cpk values. I hope I made my requirement clear. Thanks in advance