The Interrelationship Diagram is a team-based process improvement tool. Ideas gathered through, eg. affinity diagrams, are grouped in a circular pattern on a flip chart. Arrows are drawn to show the relationships between items, leading from Cause to Effect:
The number of arrows leading 'in' and 'out' of each item are counted and tabulated.
Items that have a high number of 'out' arrows are important drivers. A high number of 'in' arrows suggests important outcomes and candidates for measures of success.