Cause-and-effect diagrams are also called Ishikawa diagrams after their creator, Dr. Kaoru Ishikawa. These diagrams are used in identifying and organizing the possible causes of a problem. They are sometimes referred to as fishbone diagrams because they resemble the skeleton of a fish, with a head, spine, and bones.
The problem to be solved is placed in the box on the far right. It should be a
well defined problem with a narrow focus, or the chart will get too large. The
spine is a large horizontal arrow that points to the problem box.
The lines diagonally pointing to the spine are the main categories of
potential causes of the problem. The smaller lines are more detailed causes of