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.


The first step is to identify a problem. Lean six sigma approach utilizes Y=f(X), a function that 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.)


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


Through your process, the graphical and statistical analysis identifies 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 the new process and monitoring Critical X’s & Y

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