The best replacement for six sigma is lean.

The best alternatives to six sigma are rated as following:
★★★★★  lean
★★★  pmp
★★★  tqm
★★  itil
★  lean manufacturing
★  total quality management
★  iso 9000
★  project management
★  cmmi
★  three sigma
★  lean six sigma
★  iso
★  lean principles
★  agile
★  six sigma
★  kaizen
★  innovation
★  iso 9001
  scrum
  pmp certification
  pmp which is better
  8d
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  balanced scorecard
  prince 2
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  deming
  cmm
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  pdca
  3 sigma

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Speaking about six sigma, one probably shouldn't forget about lean.

Other search terms related to six sigma and their ratings are:
★★★★★ lean
★★★ tqm
★★ ge
★ lean manufacturing
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Google Trends

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