DMAIC and DMADV - differences, similarities and synergies

Define, Measure, Analyse, Improve, Control (DMAIC) is the well-known Six Sigma methodology, while Define, Measure, Analyse, Design, Verify/Validate (DMADV) is the most commonly used methodology within Design for Six Sigma (DfSS). Many emphasise the differences between the two, but there are similarities as well. Based on Donald Wheeler's four process states, it is suggested when it is appropriate to use DMAIC or DMADV. However, in one specific state, which is quite common, neither of the two is appropriate. In the case of a process that is out of control but with only minor customer problems, a combination of DMAIC and DMADV, called for Define, Measure, Analyse, Design, Control (DMADC), is suggested. It was developed from experiences gained in process-improvement projects at Siemens in Sweden. Furthermore, contrary to the views of some authors, it is argued that there is no such thing as a 'five-sigma wall' between DMAIC and DfSS when improving processes.

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