CEDAC

CEDAC stands for 'Cause-Effect Diagram with the Addition of Cards'.

It is a simple approach to using Cause-Effect Diagrams with Post-it Notes or 3" x 5" cards for the causes, thus allowing shuffling around of the causes and also letting several people participate simultaneously.

There was even a complete book written on the subject. (I remember someone going on a two-day course on it, and commenting that it was useful, but could have been covered in much less time...).