Define-Measure-Analyze-Improve-Control is a formal problem-solving process, and a major tool of Lean Six Sigma, based on formula Y= f(X), metric that measures the problem.


First step is to identify a problem. Lean six sigma approach is to utilize Y=f(X), function defines one variable in terms of another. The statement “y is a function of x” (denoted y = y(x)) means that y varies according to whatever value x takes on.

Example: Quality=f(Process control, Raw material, Equipment etc.)

  • Cost of Poor Quality
  • Critical To matrix
  • Pareto Chart
  • Voice of the customer
  • KANO Analysis
  • Survey Design


Capture data on the Y metric (if not already available in Define) and also “Potential X’s” that we believe could impact the Y.


Through you process, graphical and statistical analysis identify the “Critical X’s” (or Root Causes) that truly impact the Y.


Identify and test solutions to the Critical X. Rollout out solutions that eliminate the Root Cause


Sustain the improvement by standardizing new process and monitoring Critical X’s & Y



Six Sigma

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