• 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

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

Measure

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

Analyse

• Verify root causes

Improve

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

Control

• Standardise and control the process
• Sustain the improvement

More information on tools used in DMAIC.

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