Studies on Lean and Six Sigma initiatives routinely put failure-to-sustain rates in the 60–90% range. Six Sigma failure post-mortems keep landing on the same three culprits: poor training, weak buy-in and bad change management. So let's dissect that. Poor training: Your training system has to overcome 3 things to work. 1) You have to get people to listen. This only happens if they think they need to. 2) You have to get them to remember. People forget 90% of the information