Six Sigma thinking

  • The principle behind Six Sigma is that the output of a process is improved and controlled by first determining the key inputs that affect the output, then changing and controlling these key inputs.
  • The relationship between inputs and outputs to a process is often expressed as a mathematical formula – Y = F(X1, X2, X3…), where Y is a measure of the output and the X’s are the measures of the inputs.
  • The roadmap used in Six Sigma is Define, Measure, Analyse, Improve and Control (DMAIC).

What are the key deliverables of DMAIC?


  • Define the problem
  • Mobilise the team
  • Engage the stakeholders


  • Measure baseline performance
  • Validate data collection
  • Identify potential key root causes


  • Verify root causes


  • Identify solutions
  • Develop implementation plan
  • Get commitment from stakeholders


  • Standardise and control the process
  • Sustain the improvement

More information on tools used in DMAIC.

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