Answer:
cause-and-effect diagram.
Explanation:
Cause-and-effect diagram is also called the Ishikawa diagram, it shows what caused a particular event by identifying, sorting, and displaying possible causes of a problem graphically.
Cause-and-effect diagram is used in product design and quality defect prevention.
The grouping of customer complaints collected and analysing for trends and patterns is closely related with cause-and-effect diagram tool of total quality management.
