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Purpose: To identify cause-effect or method-objective relationships
among related items in a system when the interactions are complex or involved.
(See also Systems Diagrams).
The relationship diagram, in contrast to the affinity diagram
which only shows logical groupings, helps map the logical relationships
between the related items uncovered in the affinity diagram. The relationship
diagram shows cause and effect relationships among many key elements.
It can be used to identify the causes of problems or to work backward
from a desired outcome to identify all of the causal factors that would
need to exist to ensure the achievement of an outcome.
The key factors affecting the main drivers can then be examined using
the tree diagram.
Process
- State the problem or issue under discussion--software defects, customer
retention, process steps, whatever. Write this on a Post-it note.
- the key issue at the center of a white board or on one side or the
other.
- Generate cause-effect issues by brainstorming or by using the notes
generated for the affinity diagram (except the header notes) and arrange
them according to cause-effect. (Note: There should be more than nine
and less than fifty notes when completed, otherwise the problem is either
too simple or too complex for this method.)
- Draw one-way arrows to indicate the cause-effect relationship among
all of the components of the diagram. Avoid two way arrows; decide which
component has the most influence and draw the arrow in one direction
only.
- Identify the key issues (ones with the most arrows coming out of them)
with darker lines or other shading.
Find out more about affinity diagrams at: asq.org
The Relationship Diagram is just one of the tools included in the QI
Macros for Excel SPC Software for Excel.
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the FREE 30-day Evaluation copy of the QI Macros Excel SPC Software for Six
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