What is Cpk (Simple Explanation of Cp and Cpk)

[@shermanwong6857]

OMG, your my life saver... I don't have to read 23 pages of explanation just to understand what is cp and cpk!! Thank you so much!

[@learnkaizen]

My pleasure! Happy to help. Once I figured this out, I had to share! 🙏

[@learnkaizen]

I hope this video makes Cp and Cpk a little clearer. If this video helped you, please comment "HELPED" in the comment section! If you have other comments or questions, feel free to put those here as well.

[@raymster8450]

Where were you when I learned this? I had some hair pulling moments, you made it clear and concise with great visual examples!

[@learnkaizen]

I completely understand. I had the same problems early on in my career…The instructors I had would never fully explain the complex topics (like Cp/Cpk)…I decided to dig deep on those topics to truly understand what they mean…Cp/Cpk was one of those that drove me crazy. Then I thought: “I bet others are having the same issues…I’ll start a YT channel to help” - this isn’t a popular topic/subject and I don’t get a ton of views but when I hear stories like your’s, it keeps me motivated to make more videos. Thank you for the feedback. Hope you consider subscribing. Let me know if I can make any specific videos to help. Thanks again. 🙏

[@raymster8450]

I subscribed immediately! For me fitting the big truck and motorcycle into the garage gave a visual that makes sense. Also the sketches showing the correlation between the spec and curve were great as well.

[@learnkaizen]

Awesome. Thank you.

[@aherwal05]

Very well explained, most of the SS trainers just talk about numbers and don't emphasize on concept. Your video clears the concept which is a really really great learning for students. Thanks again for spreading the knowledge.

[@learnkaizen]

Thank you! Once the concept is grasped, one can translate and use for other applications! 🙏

[@madisonweiss3965]

Learning this for my Six SIgma Green Belt- this was explained very clearly. Thank you!

[@3my408]

I don't usually comment on KZbin videos, but your video saved me! Thanks so much!

[@learnkaizen]

Awesome! That’s why I make these videos. I know this field of work has some complex topics. fWould love to know how it saved you....? Appreciate you and your support! 🙏

[@andrewyang9752]

This guy is extremely intelligent. Thanks for the lesson!

[@learnkaizen]

Thank you 🙏…I’ve just been doing this work for a long time…but I appreciate the kind words.

[@kevinhill4929]

Super helpful and clear! This video helped me more than hours searching other resources.

[@learnkaizen]

Awesome! Appreciate your feedback! 🙏

[@syleshkumar8175]

Thank you so much for the clear explanation. I have a query @4.02 - If the Cp=1, then the process is operating at a sigma level of 3. Shouldn't this mean that the defect rate is 31.7%? (A defect rate of 0.3% means the process is operating at a sigma level of 6 and Cp of 2.)

[@thomasgrinley3612]

Finally have a good concept of Cp and Cpk

[@gunaitarde9312]

Thank you so much for the video, well explained! I had a question about the formula, what is the reason behind using 6 times sigma?

[@learnkaizen]

This video may help answer your question: kzbin.info/www/bejne/b5i3gpl3r913p5Ysi=0gxabxYGc9_T7sda

[@gunaitarde9312]

Yes it did! thanks a ton, I will remember this for long due to the examples given @@learnkaizen

[@learnkaizen]

@gunaitarde9312 great! Thanks for watching. Consider subscribing…going to put out more videos in 2024.

[@gunaitarde9312]

@@learnkaizen done!

[@danezu791]

Wonderfully explained, so what is more precise, 6*Sigma or 3*Sigma? If I want to determine the tolerance of a dimension, let's say I measure 50 parts then I determinte the Sigma. If I multiply this Sigma * 3 I get a tighter tolerance than if I would do the Sigma * 6. Would that mean that 3*Sigma is more precise than 6*Sigma? Thank you!

[@danezu791]

Hi, I got notified for the like. To keep monetizing my subscription on your channel could you please answer my question? Thanks.

[@luigi88953]

Hello, great lesson. I have a question. Can we calculate cpk on procurement time? For istance let's say that internal customer (management) wants to reduce procurement time from 10 days to 5 days since they think this will benefit external customer that in the meanwhile was not statisfacted of the too slow service. Would the 5 days maximum tolerance allow me to calculate a cpk on procurement time?

[@learnkaizen]

It’s tricky with one specification limit and I wouldn’t recommend it. If the goal is to reduce procurement time to 5 days, you need to understand why you’re at 10…what wastes are in the process preventing a 5 day procurements. I’d use a VSM, SIPOC and Swimlane process map. I have videos on these tools. It should be relatively easy. Many folks (especially management) want to jump right to some complicated statistical methods of analyzing and solving problems because it must be a complicated problem if we haven’t resolved it…95% of the time - all that’s needed are simple tools to truly understand the problem. May use this example as a video and walk you through it. I’m sure others have the same or similar experiences. Appreciate your question!

[@onimiashama]

Thank you for sharing. I can’t find the video on how to plot a histogram chart . Can you resend the link please?

[@learnkaizen]

kzbin.info/www/bejne/qHfchal4jbeYic0

[@datascience1274]

Hi, thanks for the lesson. I have a question about spec limits. What is the real difference between KPI and specification limits? They seem like the same thing.

[@learnkaizen]

Appreciate the question. Do you mind if I answer this in a video?

[@datascience1274]

@@learnkaizen I would so appreciate that. Can you just give us a spoiler of the answer in the meanwhile?

[@learnkaizen]

KPI represents Key Performance Indicators companies use to ensure very specific (hi-level) metrics. We call these indicators because the metrics are indicative of business performance…”is the business doing well or not”. We should tie these metrics back to numbers that are important to the customer such as On time delivery, external quality, Costs etc.…keep in mind these metrics are LAGGING METRICS…we also need LEADING METRICS that feed into the KPIs so we can address the leading metrics before they negatively impact our lagging KPIs. For example: External Quality may be measured in customer complaints or PPM (parts per million) - a lagging indicator…however to ensure we don’t turn red for that lagging indicator we need to measure internal quality so we can address any deficiencies prior to feeding the KPI. The specifications I mentioned in the video are related to customer requirements…and usually related to some kind of “widget” produced…the important thing to remember is that KPIs are the Voice of the Process and Specifications are the Voice of the Customer. As leaders we need to ensure the voice of the process (VoP) meets the voice of the customer (VoC). Does this answer your question? Thanks again!

[@datascience1274]

@@learnkaizen thank you very much. Both your videos and the way you interact in the comments are precious for us followers. I had actually wrote something that turned out to be extremely lenghty, so replaced that comment with this very last question on a pratical example. In many case studies I have seen that the goal was to reduce recruitment time, increase production and other things related to VOP (KPI). When this happens, let's say reducing recruitment time at a maximum of 3 days, can I still calculate cpk using 3 days as spec limit? I ask you because in this case spec wouldn't come directely from VOC but from VOB. How should I think in these cases?

[@learnkaizen]

Thank you for the question. You’d want an upper and lower spec. You can run Cpk with one but it’s not recommended…however I would not use Cok for lead time related issues. I’d only use CpK for measuring widgets or some physical product as an output of a process. Ask yourself: what do I want to collect this data for? If it’s to reduce recruitment time to 3 days, you just need to evaluate the process and identify wastes that are preventing the 3 day target. While you may be able to use Cpk - it’s not the best tool.

[@1sneakycat]

Great explanation, awesome tip at the end. I had an 'a ha' moment.

[@learnkaizen]

Awesome! I love helping people and when I get a comment indicating an 'a ha' moment - I feel like these videos are helping....albeit a very small niche! If you have any other questions or requests, feel free to let me know! 🙏

[@joylimingyuen2478]

Hi! Just discovered your channel, and I think it's great content for my work! We're applying LSS to a service industry now (out of the fulfillment/manufacturing business venture); would you be able to do a video about how LSS can be adjusted to a service industry where it's "less predictable"?

[@learnkaizen]

Thank you! I work in the service industry now and use lean more than six sigma...but you can certainly apply six sigma concepts to transactional processes that you’d find in a service type industry...it takes a lot of work to implement....I’ll think on this one and see what I can come up with! Appreciate the idea. Thanks for supporting me and my channel. 🙏

[@joylimingyuen2478]

@@learnkaizen Thank you very much!! Because I've been struggling a lot trying to "localize" it and really make it its own. People get lost once we talk about process. Would Cp/Cpk still be relevant? It still almost seems like so because all outputs from teams need to have high quality? Hihi

[@learnkaizen]

It may be relevant. - it’s important to figure out what you really need then implement the tools...it may take some trial and error before you figure out what works...unless you can bring in a coach or consultant...appreciate the comment!

[@joylimingyuen2478]

@@learnkaizen Thank you!! Excited for this.

[@jryanhale6037]

Hello sir, do you have a tutorial for filling out the lean six sigma waste walk excel template for Villanova’s Lean Sensei Course?

[@learnkaizen]

No...sorry...don’t have any content around that...

[@anasgheith.9076]

Delicate explanation. Many thanks, Sir.

[@learnkaizen]

Than you

[@DocS-i1e]

At 4:10 you say that a Cp of 1 means that your process is centered between the specification limits. Not so! Cp is a measure of the Potential of your process; what your process could be if your process was centered. Cpk will tell you if your process is centered, and is a more accurate reflection of process capability.

[@learnkaizen]

@@DocS-i1e Hey, thanks for watching and commenting. I can understand where you might get confused because many folks do when it comes to Cp and Cpk and I mean no disrespect…let’s dive in- at 4:10, I don’t actually say the process is centered for Cp, I say the data set is right on the edge of the spec limits which is correct. Cp is a measure of dispersion related to spec limits - not potential. Both Cp and Cpk are measures of process capability while Pp and Ppk are measures of process potential. Let’s look at the formula for Cp, Cp = USL-LSL / 6 Sigma. So we literally have the spec limits in the formula- however it’s a measure of dispersion related to the spec limits. You are correct about Cpk. The ‘k’ in Cpk is the measure of central tendency. Both Cp and Cpk together will tell you if the data is centered and if the data is tight enough to fit within the spec limits. Why is this important? Suppose we have a Cpk of 0.8, what do we do? Well, if we look at the Cp and the Cp is NG, we know we have a big problem because the process is not producing consistent results - giving us a dispersion that exceeds beyond the spec limits. However, if we look at the Cp and the Cp looks good, but the data set is not centered, we can make small adjustments to center the data. Hope this helps. Again, appreciate your comment.

[@navrangdiaries8654]

Extremely helpful. Thanks a lot for this video :)

[@mustakim2144]

Thank you so much. You explain things so well!

[@abu-ammar1474]

Thank you so much, wonderful explanation

[@chrisr5437]

Great way to simplify a complex topic

[@learnkaizen]

Thank you! Appreciate the feedback and glad you enjoyed it!

[@rajibdasgupta6436]

Helped a lot. Thanks for the video

[@learnkaizen]

You’re welcome! Happy it helped.

[@saintmatthew2634]

Chad great content! I really enjoy your style of communication and explanation of LSS tools. I would like your input on graduate degrees that a newer Black Belt could work toward to compliment and expand their LSS career. I have my sights on Data Analytics or something in that realm. What are your thoughts?

[@learnkaizen]

This is an interesting question. I’m not sure I’m equipped to answer it but I’ll share my experience...I did go to graduate school and opted for the MBA. I think this decision should be determined on your future goals. Honestly, I think the BB itself demonstrate analytical ability...I went for the MBA to gain insight into how a business operates. One of the most important things you’ll do is increase business profit. So having an understanding of finance and accounting and how they relate business ops is crucial. If you do a quick search on jobs related to BB or MBB, check out the degrees they are interested in...often you’ll see Masters degree in technical or business discipline...which covers both the MBA and Data Analytics. Though there are times when you’ll just see MBA preferred. Do a little research on that and let me know what you find out....others may see this post and be interested in the results. I appreciate your support on my channel! 🙏

[@nadajamal2642]

@@learnkaizenhello chad, I came across your channel and your videos are really helpful to understand, however, would it be possible to do some financial/accounting videos of the basics that need to be known for a green belt consultant? Also another request would be, can you walk us through how you would handle a green belt project so we can visualize what would be happening in real life?

[@learnkaizen]

@@nadajamal2642 great topic ideas. Thank you so much the suggestions and I will absolutely add these suggestions to my list of videos to make.

[@jryanhale6037]

Hello good sir, forgive me for reaching out like this but I was wondering if you could help me with my Villanova University green belt project? I’m asking someone to simply coaching me step by step on how to use the excel tools they’ve asked us to complete our project in. The school doesn’t offer and one on one hands on approach and I need that especially having a TBI traumatic brain injury from my time in the army and being injured in Afghanistan. Please help if you can. I only need an hour or two of someone attention that knows this stuff and I’ll even pay.

[@learnkaizen]

I’d be happy to help. We’ll just need to work out the communication method...you can email me at [e-mail]

[@מלאכישור]

Thank you!

[@sanchezr210]

Helped, thank you!

[@learnkaizen]

Thank you!

[@WT7005]

Great job! Thanks

[@learnkaizen]

Thank you.

[@AbbyCole727]

HELPED... thank you.

[@learnkaizen]

🙏

[@allisonorellana363]

Thank you

[@learnkaizen]

You’re welcome! Thank you for supporting the channel and watching my videos! 🙏

[@abhinavpachpute355]

HELPED

[@learnkaizen]

🙏

[@itsudhayan]

Great bro...

[@learnkaizen]

🙏

[@hcikamutiara1804]

thank youu

[@learnkaizen]

🙏

[@Baserunner20000]

Agreed two inches is optimal some might say that is too big

[@learnkaizen]

Not many though.

[@Meskeetdog]

Thew music is SO distracting ! It sounds like a cell phone ringing....

[@learnkaizen]

Point taken. Will remove in future videos. Thank you for helping me continuously improve! 🙏