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  • #28209

    Schuette
    Participant

    When are the DfSS tools used versus the traditional Six Sigma Tools? Should DfSS tools be used in the design and/or redesign of service? I am looking for clairification and separation if any.

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    #69923

    Whitehurst
    Participant

    Jim,DFSS tools explore a process more deeply than a basic DMAIC approach. In essence, after applying DMAI to a process, you should measure your gains and determine if you’ve achieved your goal. If not, it may be time to consider more in depth optimization. The IDOV cycle associated with DFSS can be nested within the DMAIC cycle in this manner.DFSS will take you through the steps of process optimization at another level, but will not necessarily entail a redesign of that process (or product). After completing an optimization cycle, you will again be faced with the same question of gains relative to your goal. This time through, you will be better equipped to redesign if needed, as the optimization process will clearly quantify the gains to be had from the critical input variables that you did control, as well as the noise variables that may be the subsequent target of your redesign.Joe

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    #69974

    Mikel
    Member

    Say what?DFSS is more in depth? How?I suspect you don’t have a clue.

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    #69977

    Whitehurst
    Participant

    Thank you for the cordial reply Stan. I’m tempted to pass on a reply. Nonetheless…By more in-depth I mean that it allows for a more refined optimization of a process. For example, since you’re an expert, you realize that the output of a DOE can be used as is to reduce variation. However, using the transfer function derived from a DOE and EVA as starting points, you can dig deeper by optimizing the variation of the critical output with respect to the input means (parameter design) and with respect to the input variation (tolerance allocation).While these statistical analyses are not necessary in every case of process optimization, they can be employed when the DMAI outcome does not meet your intended goal. Hence the reference to nesting the “in-depth” optimization process inside the Six Sigma methodology.I trust you’ll tell me why this doesn’t meet the Stan Clue Rule of Thumb.Joe

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    #69993

    anonymous BB
    Participant

    Joe – I think you’re spot on, and it’s Stan who is clueless about DFSS. 
    But then again, I’m the DFSS expert in my organization who keeps carping about the iterative and inter-related nature of all design work / engineering – ESPECIALLY where you are designing processes which will be performed by the most highly variable “raw material” you normally get in manufacturing – people. 

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