This diagram, also called an Ishikawa
diagram (or Cause and Effect Diagram), is used to associate
multiple possible causes with a single effect. Thus,
given a particular effect, the diagram is constructed
to identify and organize possible causes for it.
The primary branch represents the effect
(the quality characteristic that is intended to be improved
and controlled) and is typically labelled on the right
side of the diagram. Each major branch of the diagram
corresponds to a major cause (or class of causes) that
directly relates to the effect. This type of diagram
is useful in any analysis, as it illustrates the relationship
between cause and effect in a rational manner.