Following is the relationship between Cp and GRR:
Cp(Actual) = Cp(Measured)/sqrt(1-GRR^2). If there is no significant mean shift in your process, the above formula holds true for Cpk’s as well.
Cp(Actual) = True process potential (cannot be directly measured as the it is being effected by the measurement device that is being…[Read more]
For most process related issues, root cause analysis should focus on two aspects i.e occurence and escape. In a G8D, process for (D4) Root Cuase analysis, find out the reasons that caused the issue to happen in first place. This addresses occurence aspect.
For escape: Figure out the reasons why the issue was not detected after it…[Read more]
Ford’s 8D (Eight Disciplines) problem solving methodology works great. 8D steps and template format may be protected under IP. However I’ve seen other formats like 6-step problem solving templates which skipped thanking team (D8) and combined “Chosen Permanent Corrective Actions (D5) and Implemented Corrective Actions (D6)” as one…[Read more]
I’ve used C&E matrix with great success in problem solving meetings. This works great particularly when team members with strong personalities are involved in root cause analysis meetings.