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defect rate

Six Sigma – iSixSigma Forums Old Forums General defect rate

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  • #50999

    Saherngu
    Participant

    Hi,
    Can the goal of sixsigma project be to produce 5% or less defective products?
    So if defect per day is the metric, 99.99996% of the times we have 5% or less defects, can we claim that  our process CP>=2?
     thanks
     

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    #176112

    Mikel
    Member

    No. That may well be the most uninformed question I have ever seen. I
    hope you did not pay much for training.

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    #176115

    Darth
    Participant

    Despite what Stan said, you can claim anything you want. We live in a democracy and free speech is protected. Of course claiming something doesn’t make it right and Stan seems to think your statement doesn’t make sense. By the way, did you receive your training from Stan?

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    #176129

    Mr Kid
    Participant

    James,
    Yes, your project goal could be to reduce defective products to <5%.  Sometimes technology and cost limitations may keep a "Six Sigma" project from having a 6 sigma target.
    No, you should not claim that your Cp is now 2 because “99.99996% of the times we have 5% or less defects”.  Why would you want to do that?  You should be transparent about the current status of your process if you have aspirations of ever improving it further.

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    #176147

    will
    Participant

    Seriously, I agree w. Mr. Kid that the project goal can be stated as you proposed.
    However, many of the other assumptions are greatly suspect.
    1. First, I would not use a defects/day metric, particularly if production volumes differ day by day. Use a baseline to normalize the defect metric based on production volume, e.g. defects/unit or defects per million (DPM).
    2. The Cp=2 assumption is not a good one either. I believe you should identify a key measurable parameter which is an indicator of product quality and use that to determine Cp and Cpk. Secondly, Cp is not a good indicator if there is a mean shift in the data from the target value of the parameter chosen, which there will be every time you collect data to analyze! Use Cpk.

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    #176151

    Robert Kluttz
    Member

    And therein lies the rub.
    People seem to think that using sigma as a barometer allows us to rationally compare industry to industry, company to company & process to process.  That couldn’t be farther from the truth.  A 3.5 sigma company can have far less true variation than a 6.0 sigma company (if the 6.0 company has a far more liberal operational definition of a defect – much like the one in the original message).
    While you can define a defect as anything you please, the only way that your sigma score would mean anything at all would be if your defect definition is directly traceable to a documented customer requirement or specification.  If your customer can live with 5% daily defects but not 5.1% daily defects, yours would be a fine measure (in theory).  But I doubt thats the case. 
    To summarize, if your operational definition of a defect isn’t driven by VOC, then it doesn’t mean a whole lot.
     

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    #176168

    Mikel
    Member

    Yo mama.Cite your reference post. I am pretty sure I just called the Plackett-Burman just plain stupid. I
    did not give it the high distinction of the most uninformed.

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    #176170

    annon
    Participant

    I beg to differ….I believe the reputation of Mr Plackett, Mr Burman, and myself were all equally besmurched, although I am pretty sure you brought my family tree into question at some point……

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    #176171

    Mikel
    Member

    Okay, I probably did. My standards were not set low enough at the time.
    I’m sorry for any distress this has caused you.

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    #176172

    annon
    Participant

    Apology accepted, and I am glad I was able to aid in lowering the collective bar….”Setting low standards and failing to achieve them”….its what I do.

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    #176175

    Dennis
    Participant

    I cannot believe the total lack of professionalism displayed in these messages by Stan and Anon.  This is a professional website here to have questions asked not to view the childish vulgar language displayed by two low lifes

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    #176176

    annon
    Participant

    Professional?  How long you been tunin’ in?
     

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    #176177

    Dennis
    Participant
    #176178

    annon
    Participant

    Does it say anything in there about thin-skinned little pinheads inserting themselves into the conversations of others?  I didnt see it…….

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    #176179

    Darth
    Participant

    Stop and read. Many threads include sub-conversations within the original posting. When you’re ready to respond, select the “Post A Reply” option (not the “Post A New Message” option) and make sure that you’re currently reading the post to which you want to reply. Many posts often get lost because a user will attach it to a wrong original post, or worse yet, post a whole new message when they wanted to post a reply to a particular message.  Well, don’t see how this one was violated.
    Do not promote products, services or businesses on the discussion forum. The iSixSigma discussion forum is not a medium for user or business advertising. Violators will have their post removed and could be banned from further postings. Please read iSixSigma’s full policy on promoting products and services on the forum.  Nobody was promoting any products or services.
    Do not post open jobs or positions on the discussion forum. Instead, post them on the iSixSigma JobShop. In addition, we are not allowing resumes to be posted to the discussion forum (you can do it in the Job Seeker section. We realize that many iSixSigma readers need new career challenges, but the discussion forum is not the appropriate vehicle to advertise your skills. Nobody looking for a job.
    Write a well worded question and description. Nothing solicits comments and suggestions from experts more than a well thought-out problem statement with appropriate data. Make sure your posting has a question if starting a thread. If the post is nicely worded, it may even be highlighted in one of the iSixSigma newsletters with circulation to over 27,000 professionals worldwide — a sure bet you’ll receive the input you need.  Insults were well worded.
    Stay on topic. Replies should be answers to the original question. Try not to create sub-conversations in a thread as it complicates reading and really doesn’t belong in the thread. If you have a discussion topic that was generated from reading a thread, just start a new thread.  Hey, ya don’t like the topic, don’t read the post.
    Be considerate to others. It should go without saying that you should treat others as you would like to be treated. If needed, iSixSigma Community moderators will delete repetitively rude, obnoxious and abusive forum posts. Moderators also have the ability to ban users from posting to the discussion forum entirely, but we hope to never use this functionality.  Stan enjoys being treated that way and consideration is in the eye of the beholder. Guess moderator thought it was OK since he didn’t delete so who made you the Judge?
    There are no dumb questions. Many readers do find users obnoxious if they haven’t made a good faith effort to determine if a similar topic has been previously discussed. For instance, let’s say you’re in India and you want to find local trainers of Six Sigma. Search the forum for “India training” or simply “India” (sans quotes) and sift through recently discussed topics. If you know of an answer to a question that has been previously asked, don’t hesitate to link to a previously answered post. There are certainly a lot of these and they are responded to accordingly.
    Don’t abuse the forum. This should go without saying, but certain posters have required this specification. Do not post under many screen names in order to support your position. Don’t try to deceive. Do no harm. We track information associated with each post and abuse will not be tolerated.  Stan has been Stan for years so no violation here.
    Conclusion is, stop your whining and if you don’t like what goes on here either leave or contribute something useful.

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    #176180

    Robert S
    Member

    Darth, very thoruough analysis of the applicability of Dennis’ protest. Not sure all the conclusions you made are valid but that’s not the point of my post.
    I particularly liked your response for item No. 6…”who made you the Judge?”. Seems that’s the exact argument I used recently with someone who was hassling me. Hhmmm….

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    #176181

    Mikel
    Member

    Agreed that Darth did a good job, although it appears he may be
    having a slooooooow day.I especially like rule # 2.

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    #176182

    Robert S
    Member

    Yep. So it appears the iSS moderator will remove any posts that violate this policy. Ergo, those not removed must not violate the policy.

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    #176183

    Darth
    Participant

    Game, set, match. 
    And another thread is hijacked by the ongoing joust between Stan and Robert S.

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    #176184

    Mikel
    Member

    Hey Darth,You want to take bets on whether I can make him act badly before 5
    EST?A bottle of good tequilla?

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    #176186

    Darth
    Participant

    You started it this time you big bully.  Now you have Dennis to contend with as well.  Just got back from Mexico last night.  I am fully stocked with good tequila for a while.  Maybe Robert will heed everyone’s advice and ignore you…at least until 5:01 EST.

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    #176188

    Vallee
    Participant

    Wasn’t me who waved the red flag this time. I put myself in time out after the last post.HF Chris Vallee

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    #176189

    Robert S
    Member

    Ha Ha. Made it to 6:08!!!

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    #176190

    Darth
    Participant

    Robert, I will be happy to share the bottle of tequila with you.

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    #176192

    Robert S
    Member

    Very kind of you Darth…however you can keep it. I’m not much of a drinker any more. Found it makes me want to argue with people….among other things.

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    #176193

    Mikel
    Member

    Blaming your immature behavior on drinking? Maybe it’s time to try
    that born again nonsense too.

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    #176234

    Saherngu
    Participant

    Thank you all for your help, I have not get my training by Dan and god forbid by Stan either. (it was a self training)
    5% is not acceptable for our clients, but right now, the “Claims” processing completion rate is only 9% (the completion date is set by clients!! It means 91% of claims are over due)
    don’t you think the Service industry clients really have much much lower expectation compare to manufacturing? there is no wonder the biggest service industry is falling apart and we need 700 Billion to fix it

    Thank you all again

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    #176238

    Mikel
    Member

    If you were trained by me, you would know the right answer.You should be so lucky.

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