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The fourth step is to count the defective opportunities within the sample group. This is done by multiplying the number of units in the sample group with the number of defect opportunities per unit. The third step is to determine the total number of defect opportunities ONLY for the sample size under consideration. Focus on the features that will impact on customer satisfaction and make sure that the traits are measurable. Some characteristics of the products may be important to clients and others might be nice-to-haves. Going through this process, you have to keep the Voice of Customer in mind. Grouping or merging related or similar defects into one category.Focusing on routine, rather than rare defects or errors.Focusing on places or process steps where something can go wrong and not on the ways it can go wrong.Creating a list of potential defects or errors per unit of process or product or service customers will care about.That means, opportunities will have to be defined with the help of following methods: The second step is to determine the number of defect opportunities per unit. As a thumb rule, the sample size should be small enough to be manageable, yet large enough to reflect whatever problem is undermining the process. In other words, you have to determine the sample group size. The first step is to determine the total number of units to be sampled. The first four stages of DPMO calculation are similar to that of computing Defects per Opportunity or DPO. There are five steps to calculate process’s Defects-per-Million-Opportunities. The metric tells you how good your process is towards committing mistakes. It is a measure of the error rate of a process. DPMO is a long-term measure of process performance. It is defined as the ratio of the number of defects in a sample to the total number of defect opportunities multiplied by 1 million. It is also called as NPMO or Nonconformities per Million Opportunities. Defects-Per- Million-Opportunities (Formula and Illustration)ĭefects-Per- Million-Opportunities, which is abbreviated as DPMO.5 steps to calculate process’s Defects-Per- Million-Opportunities.
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There are various metrics used to evaluate defects: Defects per Unit ( DPU), Defects per Opportunity ( DPO) and Defects-per-Million-Opportunities (DPMO).Īttend our 100% Online & Self-Paced Free Six Sigma Training. Part of the Six Sigma method is to calculate the number of defects that the process delivers.
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In the Six Sigma approach to problem-solving, a Six Sigma professional will review the process to determine where the points of pain are and how to improve the process. Any business who wants to produce quality products that deliver on customers’ expectation will do well to employ staff with Six Sigma Green Belt Certification who have completed classroom or online Six Sigma training.