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Amit Kumar Ojha

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  • Amit Kumar Ojha changed their profile picture 2 years, 8 months ago

  • Amit Kumar Ojha's profile was updated 2 years, 8 months ago

  • The survey is one of the most important data collection tools in the armament of a Six Sigma practitioner. There is no lack of research literature on the principles and designs of effective surveys. While the […]

  • Dear Pravin,
    First of all RCA is a very generic term and given its wide use it can be used for both type of causes. However, I would like to understand where is it written that special causes can not be controlled or same for common cause. I suggest you are missing the whole purpose of six sigma. 2 years, 11 months ago

  • In the Analyze phase of a DMAIC (Define, Measure, Analyze, Improve, Control) Six Sigma project, potential root causes of variations and defects are identified and validated. Various data analysis tools are used […]

  • Amit Kumar Ojha's profile was updated 3 years, 7 months ago

  • @leaning:

    There are 6 Standard Deviations between Mean and the nearest specification limit for a process operating at 6 sigma level.

    So in case both specification limits are present, there would be [-6 to +6] 12 SD between USL and LSL.
    5 years ago

  • @chris another way of doing it is to first collect all the data which can be easily fetched which would be around 40-50 out of 1000 (I am taking the data only for the current year) and then listing those 40-50 data points and randomly selecting 15-20 out of it.

    But then it would not be considered as random sampling. Thats why what I did is to…[Read more]

  • @ Chris.. You are absolutely right, however I think that I did not make the problem clear enough. Let me try once more:
    See we have a process wherein data (numerical) is entered into two different systems (I understand this is redundant and needs to be eliminated at first) pertaining to few entities(multinomial) which are named differently in the…[Read more]

  • Hi Vikas,

    In other words I would say that occurrence rating which you need to enter to calculate the RPN is actually the probability of occurrence (it does not imply that the particular failure must have occurred) and hence I think Shelby has given you various methods by which you may figure out the same.
    5 years ago

  • Hi Vikas,

    In other words I would say that occurrence rating which you need to enter to calculate the RPN is actually the probability of occurrence (it does not imply that the particular failure must have occurred) and hence I think Shelby has given you various methods by which you may figure out the same.
    5 years ago

  • Perfectly elaborated by Mike and Shelby!!!

    In Software Industry, Internal Quality Audits (Functional Testing done by BA Team, Performance and Security Testing done by concerned teams) during testing phase can be valuable if those are done with the focus on customer requirements. In this aspect Audits do add value on unveiling lot of defects…[Read more]

  • Thanks Robert for the reply. I understood what you are suggesting me to do. But the problem we are facing is that I can not randomly choose the sample. Fetching the data for any randomly selected data is again difficult. Actually there is a system in which a lot of data is just entered and it is not organized. In order to fetch the data for any…[Read more]

  • Hi All,

    There is a situation where I need some suggestion.

    There is a process in which although the population size is more that 1000 however since data collection is extremely tedious and costly, hence we have no option but to go ahead with the sample size of 15-20.
    Although I am using the appropriate statistical test (since sample size is…[Read more]

  • Rightly said Chris and Don Strayer. As I have been implementing Six Sigma Projects in IT industry I can give you some example of how we use it.

    There can be two aspects here as mentioned below:
    1. Improving the Quality of the Software or Software Development Process – In this aspect Defect Density (Defect / KLOC or Defect / Function Points etc),…[Read more]

  • Hi Prabhu,

    Another line of thought could be to consider the percentage of products recalled and finding the relationship with Market Share for each brand. Here considering both as continuous data, you can use correlation/regression to find the relationship.

    Hope it helps !!! 5 years, 1 month ago

  • Thanks Mike.
    Sincere apologies if my post had offended you. I just wanted to ask you the name of the book as I was interested. I would first go through the book mentioned in your post. Also Mike you rightly mentioned about the current trend. I have a very small 3 years of experience in Six Sigma where I have seen people using the tools just for…[Read more]

  • Dear Mike,

    Thanks for enlightening me!!! I was not aware that it started as just MAIC. I would definitely want to read you book so that I can learn from your vast experience. 5 years, 2 months ago

  • Hi John,

    My simple response to your query would be – No it does not overlap. Mentioned below is the explanation for the same.

    The purpose of Define phase is to know the problem and build consensus on taking the project ahead by getting buy-in from sponsor. Basic tools used in define phase are Business Case, Project Charter, SIPOC, VOC, Affinity…[Read more]

  • Hi Mo,

    First and foremost, you need the exact count of the following entities for calculating DPMO:
    1. No of Defects (D) (and Not Defectives) even if its in percentage you can easily use the implied value i.e. in you case if there are 60% defectives rates (assuming each defective has only one defect), no of defects you can take as 60.
    2. Total no…[Read more]

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