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Urgent help, Process mappingprioritizing

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  • This topic has 7 replies, 6 voices, and was last updated 17 years ago by CT.
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  • #40080

    newbie
    Participant

    Hi experts, Urgent help needed please, Thanks in advance:
    I complete the initial process mapping and C&E for collecting my X’s, besides completed prioritizing the variables using prioritization matrix (C&E matrix). In the process map we split our whole process into 5 separate steps. Now I have different out puts and different inputs for each five steps. Some steps have three outputs some have two. When I multiply the ranks of inputs to the corresponding outputs and add them to prioritize I will get higher values for the steps which have three outputs (9×9 < 9x9x9). My question is how will I prioritize these X’s? Should I have to consider each step separately and take the highest ranked X’s or should I consider the whole process step together and prioritize (take the highest ranked X’s)?
    Newbie

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    #123331

    Mr IAM
    Participant

    Not sure if this will help but, I usually start by prioritizing the Y’s (outputs) which are most critical? Where is the largest performance gap?  Then, focus on X’s related directly to those Y’s in the cause and effect matrix.  I don’t usually map the X’s to the process step initially in the Define Phase, I map them to the Y’s I’m focusing on.  Probably not the only approach, but works for me.

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    #123340

    newbie
    Participant

    MrIam;
    Thanks for the reply. I think all my Y’s are important. we gave ranks to all Y’s and all X’s. For example. Suppose one of the steps in the process is coating. For this step, Y1= surface finish, Y2= coating thickness, X1= Time, X2= Temp.
    We rank all the X’s and Y’s and sum it yo for each X. Example , in the above case if the team came up with a rank of 9 for all the X’s and Y’s. that is X1=X2=Y1=Y2 = 9. Now we calculate rank sum , which is equal to(X1*Y1 + X1*Y2) 9*9+9*9 = 163. We do the same for all the X’s. Then go to another step of the process, do the same.
    Say the team thiks that we have to considor all the X’s above rank 100 to the next step (which is FMEA). Now the question is , when i considor X’s should i have to considor each steps or the whole process.
    Thanks once again for the input, may be someone else can help me
    Newbie

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    #123341

    Vikas
    Member

    I agree with I AM .
    There are different ways of looking at the X’s.
    One of the things that u might want to do is ANOVA for these x’s to see how each one is behaving and then take a decision based on all the factors.

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    #123345

    Mr IAM
    Participant

    My quick answer would be to consider the whole process.  But, I’m still confused as to why all the X’s and Y’s are ranked the same, and so high.
    I still go back to the Y’s.   So, Surface Finish is Critcal, and so is Coating Thickness…. But, which one of those are you having performance problems with?  You should focus on the Y where you have a performance gap, then concentrate on those X’s.
    Hope that helps…

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    #124049

    McNabb
    Participant

    It sounds to me like you may be generally confused about the C&E — The outputs (Y’s) that go across the top of the C&E should be the major Y’s of the Big Block process you are mapping  — these are typically the outputs from the last of the 5-8  block steps you broke the process into.  It sounds like you are trying to do a C&E matrix around each block step — not around the big block. — otherwise you would not have different numbers of outputs for the various inputs at each block step. 
    I suggest you determine the major Y’s from the big block, then all inputs from all block steps should be scored against those same Y’s.

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    #124051

    My 2 Cents
    Participant

    If you have already identified your Big Y and your sub Y’s and have collected the data on your X’s, then you have gather your data on your many X’s. You must now narrow that down to your Significant X’s. This is done using regression analysis and Screening Doe’s. This exercise will lead you to the most significant X’s and you can ignore the rest.

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    #124056

    CT
    Participant

    Newbie,
     I think you really need to try to narrow your Big “Y”. Otherwise ask yourself what are trying to fix, or improve. Is it Coating thickness or is it Surface Finish? Does coating thickness affect surface finish? If so then Coating Thickness is an Input “X” not a “Y”, and vice versa. If they are both independant “y” then you may have multiple projects.
    I think your on the right track, but should really focus on what it is you are trying achieve.
    Just my Opinion
    CT

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