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Define is the first phase of the DMAIC method, and involves defining the problem or opportunity, determining the voice of the customer/customer requirements, and outlining the project purpose/scope.

This foundational phase paves the way for an improvement team to narrow and describe exactly what is being targeted for improvement. The goal(s) set during this phase define when a project can be considered successful.


For a better understanding of the Define Phase and an overview of Lean Six Sigma, check out our Free Lean Six Sigma Yellow Belt Training, Green Belt Training or Lean Training.

Elisabeth Swan

Elisabeth is a Master Black Belt at, the co-author of The Problem-Solver’s Toolkit and co-host of the Just-in-Time Cafe. For over 30 years, she's helped leading organizations like Amazon, Charles Schwab and Marriott International, Inc. build problem-solving muscles with Lean Six Sigma to achieve their goals.
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