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question on defect and opportunity…

Six Sigma – iSixSigma Forums Old Forums General question on defect and opportunity…

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  • #39342

    Mohamed
    Member

    Hi,
    I am working on a process and I am confused regarding defect and opportunity. I need to clear this up to calculate my sigma level. I have 20 units, each with 2 critical to quailty dimensions.  So I think I have 2 opportunities per unit, making it a total of 40 opportunities. On measuring I found that all the 20 units were out of spec for both dimensions. Does that make my total defects as 20 or 40?
    I guess I am correct on the no.of opportunities but I need to know if the total defects are 20 or 40.
    Please suggest.
    Thanks a lot,
    Shyam.

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    #119466

    Amar
    Participant

    Each Opportunity is an “Opportunity for Defect” … go by that and you will have the number.

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    #119467

    Anonymous
    Guest

    Amar,
    This is only true if all opportunities are random and independent. Furthermore, many opportunites are autocorrelated from one step to another.
    However, all these assumptions are easily checked by ensuring that DPMO predicts yield. If it doesn’t something is wrong with the assumptions.
    The only exception I am aware of is ‘reliability hazards’ since these will not affect functional yield – but they will affect the yield after accelerated life testing.
    Andy
     
     

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    #119468

    hari
    Participant

    Shyam,
    The answer to your question is that you have 40 defects. Hence your DPO is 1 and DPMO is 1000000 or yield is 0%. You cannot calculate sigma level.
    The suggestion to your situation is hat since you are dealing with dimensions (continuous data), find the average, std deviation and use the spec limits to find the sigma level.
    Hari.

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    #119470

    P3
    Participant

    I wasn’t really sure what you were aiming at, until I saw the other replies with dpmo, if that’s what you want to calculate (or is it some kind of yield).
    If you find 40 defects (flaws on one or more items), regardless of how many items you have, it’s 40 defects. Those defects can of course be found on 1 or 40 defective items.
    Each defect is a flaw, and since you observed it (meaning you’re measuring/inspection it) it’s an opportunity.
    In your case you can have up to 20 defectives, and if you’re looking at independent events (Andy’s remark) you can have up to 40 defects, which is your number of opportunities.
    If you’re calculating a yield (item based) you have 20 defectives.
    /P3

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    #119471

    JJ
    Participant

    Number of units is 20 and total opportunities is 40
    total defects is 20
     

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    #119476

    Mikel
    Member

    What a stupid suggestion. Instead of sitting around figuring out creative ways to calculate sigma, go fix the problem!
    I can see it now –
    Manager – “Shyam, what have you spent the last week doing?”
    Shyam – “I found all my capability study units to be defective for both critical dimensions. I went to iSixSigma and got advice that I couldn’t calculate my sigma level so I spent the rest of the week finding creative ways of getting you a number. After much work I am proud to tell you that CTQ#1 is a 1.1 dsigma level and CTQ#2 is a .21 sigma level.”
    Manager – “Did you fix the problem?”
    Shyam – “?”
    Manager – “I sure am glad I only gave this program my idiots instead of my best people”
    Shyam – “I understand there is an opening at Whizlabs. should I look into it?”
    Manager – “I’ll give you my highest recommendation”

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    #119489

    Mikel
    Member

    Your definition of an opportunity is wrong!

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    #119527

    Amar
    Participant

    Wrong…All opportunities have defects, which is 20×2. 40 defects. 20 units are defective and each unit has 2 defects.
     But I agree in scenarios like this… fix is more important than the measurement :)

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    #119610

    hari
    Participant

    Stan,
    I do agree that fixing the problem is important. But Shyam needs to know how to calculate the Sigma levels. Only then he’ll be able to find the Sigma level after fixing the problems…or do a before-after study after completing his project.
    Look forward to a professional response from you….instead of using words like ‘stupid’ and coming up with fictitious conversations that are nowhere near being funny.
    Goodluck,
    Hari.

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    #119614

    Mikel
    Member

    Hari,
    What a stupid expectation that I would have to be able to calculate a sigma level either before or after. Ever heard of non value added?
    Sigma levels are of absolutely no importance to a change agent – their value, if properly calculated and used, are to Leadership.
    Shyam –
    Opportunity – a detailed count of all VALUE ADDED activities necessary to provide a product or service correctly.
    Defect – any activity over and above the absolute minimum resource necessary to provide a product or service correctly
    Hari –
    I doubt you calculate sigma levels correctly – what value is there in that?

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    #119652

    hari
    Participant

    Stan,
    You fall well below my expectations in being professional in your response. Maybe I was wrong in assuming that you are a professional. Guess you are suffering from “I-know-everything” syndrome.
    Anyways, this is not the right forum for this arguement. So I stop here.
    And….your doubt is wrong.
    Hari.

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    #119702

    Mikel
    Member

    Hari,
    You don’t fall below my expectations of you – I expected very little and got it.
    Do you have a clue what a professional is?
    I don’t know everything, I just know when I am communicating with a person who knows very little.
    Step it up and show people you know something.

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    #119714

    hari
    Participant

    Stan,
    This is not a forum to show everyone what you know. This is a discussion forum….and not for the kind of discussion that we are having.
    I don’t know you….you don’t know me. I don’t know what you are and you don’t know what I am. People who need to know who I am and what I know…..know it very well.
    We are wasting each others’ time with this meaningless discussion. You might have the time for it but not me. So I am out of this.
    Goodbye and Goodluck,
    Hari.

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    #119728

    Mikel
    Member

    Just as I suspected – you don’t know anything.

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    #119729

    Dayton
    Member

    Hari,
     
    You’re a bungee jumping wild one aren’t you?  You might want to consider changing your forum ID to Hari-kari.
     
    Vinny

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