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When designing a decision, make use of the Decision Requirements Graph (DRG), depicted by a scale icon:.
(for more info on and where to open DRG's see Decision Requirements Graph (DRG))

Let's say we 're are modeling a very simple decision that determines whether someone will receive a discount on some sort of insurance.
Females are eligible for this discount, males are not. The decision requirements graph will probably look something like the one shown below.
Use Ctrl-click on the various elements to open them and verify that the discount is modeled correctly.

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Although even for simple decisions the DRG is very useful while designing or reviewing, the true strength of the DRG is exemplified when designing or reviewing multi-layered complex decisions. See the example DRG below, that shows the decision that determines Strategy. At level 1 this decision looks very trivial.

When expanded to the next level, it shows that the decision consists of two separate decisions.

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