When I talked with my Lean Six Sigma friend Mike Negami on phone about the typical topic “Why is Lean Six Sigma unpopular in Japan”, he said that the Lean Six Sigma is getting more popular as the next step of quality improvement after the ISO 9001 certification.
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I have recently worked with the engineers in QA (Quality and Assurance) team. They have been investigating the products returned from our customers because of a problem, and tried to find the root-causes of the problem. But the returned products have never shown the problem complained by the customers even with thorough tests. We call such returned products as NPF (No-problem found).
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