Decision requirement diagrams contain the following elements:

  • Decisions: Each decision takes a set of inputs and selects possible outputs from a defined set by applying business rules and other decision logic.

  • Input Data: Represents data that must be passed as an input to a decision on the diagram.

  • Business Knowledge Models:  Represents sets of business rules, decision tables, decision trees, or even predictive analytic models describing how to make a decision.

  • Knowledge Sources: Represents the original source documents or people from which the necessary decision logic derives.


In this simple example, a corporate Policy group (a knowledge source) is responsible for defining a set of Policy rules (a business knowledge model). This set of rules is invoked to make an Eligibility decision whose output is ELIGIBLE or INELIGIBLE. The Eligibility decision uses input data from an Application form, and the results of another decision: Risk, whose output is a risk score. The Risk decision invokes a Score model to calculate the score from input data describing past Customer behaviour.

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