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Requirements vs Cost and Schedule

Six Sigma – iSixSigma Forums Old Forums Software/IT Requirements vs Cost and Schedule

  • This topic has 4 replies, 4 voices, and was last updated 17 years ago by nn.
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  • #26348

    boettler
    Member

    Has anyone tried to look at number of change request effect on cost ans schedule metrics?
    My data seem is not normally distibuted (Poisson). Any suggestions on what to do to transform the data and what type of statistics I could use???

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    #64046

    AVY
    Participant

    Rob
    You need to have a proper Operational Defination of ” Change Request”.
    You need to focus more on the kind of “Change requests”.- like whether it is related to cosmetic change or functional change which was identified in the requirement phase. The purpose for doing this analysis has to be understand first.
    If your data is not normal, convert into normal using Box-Cox transformation and then do the statistical analysis.
    AVY

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    #64047

    boettler
    Member

    Thanks for the insight. 

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    #64060

    mib
    Participant

    Hi,
    I don’t agree with later part of ROB’s suggestion, though we can use Box-Cox transformation for converting non normal data into Normal practically I will not prefer that. First thing I need to do is to find out why my data is not Normal .As suggested in the first half u can stratify your data on various parameters.
    Thanks & regards,
    MIB

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    #64062

    nn
    Participant

    Hi,
    I don’t agree either. First thing you should do is to define what the definition of “Change Request” (as AVY suggests). Change Request may include request changes to requirements, design, codes, or other project docs. Then define metrics for cost and schedule. How do you measure the schedule? Is it based on Yes/No schedule impacted or number of days to implement the change request.
    Once you identified the types of data for Change Request (independent variable) and Schedule (dependent variable), then you can check whether your data is normal or not.
    Hope this help.
    Regards,
    NN 
     

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