An interrelationship diagram (ID) shows how different issues are related to one another. It helps identify which issues are causing problems and which are an outcome of other actions. It also shows the strength of each influence.
An interrelationship diagram consists of a set of boxes, one representing each issue to be considered. It is organized in a radial pattern on the page. Connecting lines between the boxes indicates their relationship. Arrows show direct relationships and distinguish causes from effects.
Interrelationship diagrams can be extremely useful when trying to sort out possible causes of a specific problem. Although they do not identify detailed reasons for the problem, they do allow one to analyze broader issues as causes and effects of one another.
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