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DMADV Helps

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  • #30935

    Julian Yao
    Participant

    Dear all,
    I am doing a 6 sigma project using DMADV model. But I am confusing about several concepts.
    1. What are the actions in Measure phase? Need I collect data? Because I want to design a new process. There was a process running there although it is not a good one. The data maybe still useful for designing new process because it may help to find out some failure causes, etc.
    2. When do I begin to collect data in the new process I designed? From Verify phase on?
    3. When will the project be closed? After the process being stable? Reaching some sigma value? Or just it looks fine and transfer to process owner?
    Thanks alot in advance.
    Julian Yao

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    #81224

    trigger
    Member

    Hi Mr. Yao
    Why use DMADV and not DMAIC. Are you replacing the process with a brand new process or are you improving the process. 
    Trigger

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    #81225

    Julian Yao
    Participant

    Hi Trigger,
    Thanks for your advice. I am not improving the old process but re-design of new process to replace it.
    Julian

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    #81226

    trigger
    Member

    Hi Mr. Yao
    Is this the DMADV you mean.
    Dumb Manmade Approach Delaying and Vague 
    Trigger

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    #81227

    Julian Yao
    Participant

    I have never heard that model. But it looks funnyWhatever, any more helps from you, Trigger?

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    #81234

    Leung
    Participant

    Julian,
    Is this the kind of information you’re looking for on your DMADV project?:
    https://www.isixsigma.com/library/content/c020819a.asp
    Ben

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    #81267

    SS Ray
    Member

    dear Julian,
    First of all, DMADV is somewhat the same as DMAIC, my opinion is the difference is how the tools are utilized.
    To answer 3 of your questions, please refer below:
    1) What are the actions in Measure Phase?
    Well, for start, 
    1) Learn and identify (QFD or CTQ matrix) what are the Internal and External customer’s needs and requirements.  For example:
             a) Internal customer: Scrap, Process performance, Step by step performace (DFMEA + PFMEA), and etc.
             b) External customer: Specifications and requirements of the        product, and etc.
    1.a. Of course you require to collect data. What types of data? Below is one suggestion:
             a) Once you have identified the customers’ needs. Run an RTY (Rolled Throughput Yield) Analysis consists of 100 parts based on customer needs. Verify and use the data as your baseline.
    2.a.After completing the Measure Phase, Analyze the data using Taguchi method.
       b. Get your team (primarily consists of Design, Manuf, and Production Rep. who are responsible for the process), brainstorm, Design and Verify/Optimize.
    3. The project will be closed after you have achieve the targeted sigma value, ensure process is stable for a period of time depending how long you want it to be (at least for a month).
    Well, I hope this helps. The most important and critical part is to learn what are the cutomers’ needs and requirements.
     
    Later
     

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    #81328

    Stephens
    Participant

    Julian-
    Sounds like you are really wanting to conduct DFSS vs. Six Sigma. For that there are a number of methodologies from which to choose. DMADV is one. One of the most common is IDDOV (Identify, Define, Develop, Optimize, and Verify).
    May I suggest you consider reviewing “Design For Six Sigma” by Subir Chowdhury. Very good overview of the process. One of the key differences you will find that in the define phase QFD ( Quality Function Deployment  makes the transition from from fuzzy VOC or customer desires into concrete product or process specifications.
    Additionally, FMEA is emphasized more. Lastly, Robust Design is a critical tool under optimization.
    DMAIC under Six Sigma is great for fixing whats wrong in a process that exists and when you want fairly short term return. DFSS is design with NO bad or inherent variability from the start.
    DFSS is different from Six Sigma so it may help to get some more knowledge.
    Hope it helps-
    Craig

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    #81329

    Cannizzo
    Participant

    Hi Craig,You make very good suggestions and provide great advice.I wanted to clarify one point you made. You said that DFSS is different from Six Sigma. In fact, DFSS is an approach to Six Sigma. There are many methodologies that make up DFSS, such as IDDOV (you mentioned), IDOV, DMADV, etc. DMAIC is the counterpart to all the DFSS methodologies for existing product and service improvement. Both DMAIC (for existing products and services) and all DFSS methodologies (for new products and services) make up what we call Six Sigma.–Carol

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    #81330

    Stephens
    Participant

    Hi Carol-
    You mentioned a key word “we”. And that is indeed the interesting points. Some organizations place DFSS under Six Sigma while others make it stand alone and place it next to Six Sigma; meaning Six Sigma has DMAIC while DFSS has IDDOV (et al). GE’s Jack Welch stated that they wish they would have started DFSS earlier and along side Six Sigma.
    So, depending on the organization and who you talk to, folks ee it both ways. For me, I see such a differentiation that I liken it to a separate approach.
    Thanks-
    Craig

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    #81342

    Anonymous
    Participant

    Craig,
    Great keep them separate. You probably see designers as superior human beings as well.
    You said FMEA was emphasised more with DFSS? Where do you think accurate FMEA’s come from?

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    #81344

    Stephens
    Participant

    Well, since you didn’t identify yourself I can not address you by name. It is unfortunate that you decided to to take a sarcastic tone. I will wish you well in any event and say that you missunderstood.
    Thanks-
    Craig

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    #81352

    Julian
    Participant

    Hi Craig,
    Your suggestions gave me a great help. Acctually I am just beginning my 6 Sigma journey. I work at a company having most businesses with GE.
    I prefer DFSS is a separate approach, especially for the beginners of 6 Sigma. People usually are confused with DMAIC & DMADV.
    Craig, would you probably review my questions and be kind to give me answers. I think the most confusion for me is about Measure phase. Do I need to measure the current bad process for the new one I am designing?
    Thanks.
    Julian

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    #81399

    Stephens
    Participant

    Julian-
    I am glad my input was helpful. Regarding the measure phase. It can be helpful to measure the current process. However, A suggestion to consider would be to gather your VOC data as if you had no process in place, design and build your affinity diagram and QFD, as well as other necessary measurement phase tools, and then go back and look at the original process data. There are pro and cons. If the current process is so broken that total redesign  is needed maybe the old data will just clutter up the project. There are never single or “right” ways of doing things.
    Hope it helps-
    Craig

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    #81749

    Samuel Chin
    Member

    Julian,
    This information (from Kerri) just answers to your questions.
    I hope you find it useful.
     
    The Differences of DMAIC and DMADVBy Kerri Simon
    When To Use DMAICThe DMAIC methodology, instead of the DMADV methodology, should be used when a product or process is in existence at your company but is not meeting customer specification or is not performing adequately.

    DMADV
    Define Measure  Analyze   Design    Verify

    Define the project goals and customer (internal and external) deliverables
    Measure and determine customer needs and specifications
    Analyze the process options to meet the customer needs
    Design (detailed) the process to meet the customer needs
    Verify the design performance and ability to meet customer needs
    When To Use DMADVThe DMADV methodology, instead of the DMAIC methodology, should be used when:

    A product or process is not in existence at your company and one needs to be developed
    The existing product or process exists and has been optimized (using either DMAIC or not) and still doesn’t meet the level of customer specification or six sigma level
     

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    #81784

    Manee
    Participant

    When you want to improve the design, you should read more about triz, robust design, and Taguchi method.  Book by Phadke, Clausing, and creveling are good sourses.
    Manee

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    #126519

    Luca
    Participant

     I would like to know why in the original formulation of DMADV, the phase VALIDATION is missing, especially if we cross link with ISO9001 where DESIGN VERIFICATION and DESIGN VALIDATION are explicitly requested.
    Thanks

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    #126524

    Mikel
    Member

    Okay – it’s offically DMADVV as of today.

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    #126532

    Luca
    Participant

    Dear Stan,
    I don’t know where you’re working, but where I am working Validation and Verification are two aspects of the Design that must be carefully taking into account for Certification purpose. You can call DfSS with all the acronyms that you want, my question was related to these distinct activities related to DfSS methodology.
     
    Thanks

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    #167548

    Anu Chopra
    Participant

    I think that even if u r doing a DFSS and designing a new system then also data needs to be measured and coupled with the customer specifications it will be used for making setting up benchmarks for the new system to be measured

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