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QFD Customer Requirements

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  • #55737

    sam
    Participant

    Hello,

    I am working on a QFD for a new product launch and I have a few questions regarding customer requirements for the first house. Our customer has provided us a requirements document that clearly defines specific requirements, i.e. 2.5 GPM at 5000 PSI. Is this something that needs to be captured in house 1, only in a later house, or not at all? I was taught that your customer requirements should be “fuzzy” requirements, i.e. stable, durable or efficient. This product is for a single customer

    Despite QFD being around since the 70’s, I am having trouble finding good examples. Can anyone point me to a white paper that may help?

    Thanks,

    Sam

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    #201450

    Strayer
    Participant

    You are correct that QFD typically starts with “fuzzy” qualitative requirements in the first house. The idea is to drill down to underlying specifications. Since you’re starting with clear specifications, you might do better with a simpler tool such as a C&E matrix. This is an L matrix that evaluates causal factors for the desired effects (specifications). You can find information and templates at this site and elsewhere. Note: One thing often omitted from both QFD and C&E, and even FMEA for that matter, is guidance for identifying the causal factors. Even if you know the y’s (outputs/effects/specifications) the evaluation is useless if you’re just guessing about the x’s (causes/inputs). I prefer to do fault trees to identify the x’s then C&E to identify the big Y’s and big X’s.

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    #201451

    Strayer
    Participant

    I might add that we’re often taught that assigning the evaluation numbers in these tools is best done by a multi-functional team so we’re less likely to do it by personal bias. I think that’s fallacy. If we really want the numbers to be “truth” we need to do rigorous comparative analysis. That’s a lot of work so it’s rarely done. We end up with group-think conclusions about the big Y’s and big X’s, but we have numbers so it must be right.

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    #201453

    sam
    Participant

    @Straydog,

    Thanks for the reply. Is the QFD still an effective tool when developing a product for a single customer? If you have a fuzzy customer requirement, wouldn’t the first step be to reach out the customer to accurately define, i.e. durability = >1 million cycles? IF they come back with a nebulous answer I would then use the QFD for it. Does my thought process make sense?

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    #201456

    MBBinWI
    Participant

    @BuckeyeGuy92 – as @straydog identifies, what you are getting are specifications, not needs or requirements. This is the outcome of HOQ 1, not the starting point. You might consider these as the inputs to HOQ 2 and proceed to break these down into the specific design requirements.

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