The Decision Requirement Diagram shows how a set of decisions depend on each other, on input data, and on business knowledge models.
The Decision Requirement Diagram is a part of the Decision Model Notation (DMN) from OMG.
“The primary goal of DMN is to provide a common notation that is readily understandable by all business users, from the business analysts needing to create initial decision requirements and then more detailed decision models, to the technical developers responsible for automating the decisions in processes”.