Tree Diagram

Jay Arthur
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The tree diagram can map specific tasks to primary and secondary goals. It maps the methods required to achieve corporate goals. The tree diagram shows the key goals, their sub-goals, and key tasks. It can help identify the sequence of tasks or functions required to accomplish an objective. The tree diagram can help translate customer desires into product characteristics. It can also be used like an Ishikawa diagram to uncover the causes of a particular problem.

To create a Tree Diagram

1. Develop a clear statement of the problem, issue, or objective to be addressed. Place it on the left side of a board, wall, or easel and work toward the right.
2. Brainstorm all of the sub-goals, tasks, or criteria necessary to accomplish or resolve the issue.
3. Repeat this process using each of the sub-goals until only actionable tasks or elements remain.
4. Check the logic of the diagram in the same way as the Ishikawa: Start at the right and work your way back to the left by asking: ³If we do this, will it lead to the accomplishment of the previous task?²

The tree diagram is just one of the tools included in the QI Macros for Excel SPC Software for Excel.

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