Node Ordering

Node ordering refers to the nodes in a relevance diagram being partially ordered by the arrows among them—a particular arrow places its source node before its destination node. Evaluating a relevance diagram requires that its nodes be ordered as a decision tree network (ie, that every predecessor of a decision node be a direct predecessor of that node). However, this order is often inconvenient for assessment purposes. Reversing an arrow between two nodes modifies their order while maintaining decision equivalence, thus allowing assessment and evaluation to occur with different node orders.

See also: basic relevance diagram, well-formed decision relevance diagram and well-formed partial decision relevance diagram.