From the course: Six Sigma: Black Belt
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SPC chart selection - Minitab Tutorial
From the course: Six Sigma: Black Belt
SPC chart selection
- There are some important questions to consider in the control phase. First, how would operators and process owners know when to take action and when to leave the process alone? The answer is SPC charts. And the next question is, what would be monitored to make that control possible? The answer? Select the correct control subject. Based on the data type of the control subject, SPC chart for variables or SPC chart for attributes are used. For example, processing times are variable and defect rates are attributes. In any process, what should be monitored and controlled are the y, the key axis, and any relevant CTQs. For example, if y is the comfort level and one CTQ is comfortable temperature, then temperature is the x that should monitored and controlled. That means it has to be regulated to maintain a particular temperature or temperature range that is comfortable. So, temperature is the control subject. Our next question is, what data type is that control subject? Is it continuous…
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