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Voice of the Customer (VOC) Tree Diagram -


What is a Tree Diagram?

A Tree Diagram is a type of chart where a concept is successively broken down into subconcepts with increasingly higher levels of detail. It therefore resembles a tree in its finished state, with the main concept serving as the trunk, while subconcepts branch off.

For a better understanding of a Tree Diagram 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.

This Post Has 2 Comments

  1. […] During the Define phase, the team must contact customers to better understand their requirements of the process, or the “Voice of the Customer.” After interviewing or surveying customers, the team must translate that information into measurable requirements that will give the team insight on how to improve the process or solve the problem. Tools: VOC Translation Matrix and a Tree Diagram […]

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