Critical to Quality (CTQ) Tree Diagram
The purpose of the CTQ tree diagram is to systematically link customer requirements to key performance indicators (KPIs).
QI Macros add-in for Excel includes an easy to use CTQ Tree Diagram template.
The CTQ tree diagram can map specific requirements to key drivers of quality and on to a specific measurement. Tree diagrams can help translate customer desires into product characteristics.
To Create a CTQ Tree Diagram
It's often easiest to start with Post-it Notes and a flipchart and then transcribe the results to the QI Macros CTQ Tree Diagram template.
- Develop a clear statement of the customer requirement (e.g., good service). Place it on the left side of a board, wall, or easel and work toward the right.
- Brainstorm all of the drivers necessary to deliver the requirement.
- Determine the critical to quality measures that can be used to monitor these requirements.