Interrelationship Digraphs

An Interrelationship Digraph takes a group of items, problems or issues, and establishes the diverse cause and effect relationships that exist between the group items. This allows you to uncover problems which might have seemed minor, but which in reality, feed into a great number of other problems. It also helps you to find the various underlying causes behind a recurring problem that cannot be effectively addressed by itself.

When to Use

The Method

An excellent source of additional information on the interrelationship digraph definition and how it works as a Management & Planning Tool is The Memory Jogger Plus +, by Michael Brassard (Goal/QPC, 1989).

Learn more about the Quality Improvement principles and tools for process excellence in Six Sigma Demystified (2011, McGraw-Hill) by Paul Keller, or his online Green Belt certification course ($499).