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| 1 | Main | Ask yourself the question what the main decision is. If you think of more than one answer, split these decisions if possible. |
| 2 | Type | Note that a decision is not bound to be a Boolean. In general, there are three types of decisions:
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| 3 | Sub | For each identified decision, determine if the decision is preferrably built up in meaningful sub decisions. These sub decisions could be reusable decisions - in fact reusable decisions will most likely be sub decisions - but not every sub decision has to be a reusable decision. Think of a complex calcutaion where intermediate results are never reused but are created nevertheless, for the sake of understandability. |
| 4 | Circularity | Avoid circularity. When decision A depends on the outcome of decision B and decision B needs the result of decision A as input, you're in trouble! When desiging decisions top-down circular references can easliy be avoided. |
| 5 | ... |
Designtime Design time Decision Requirements Graph
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Let's say we're 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 sown below.
Use Ctrl-Click 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 an applicant's riskscore.'s risk score. At level 1 this decision looks trivial.
When expanded to the next level,it shows that the decision consists of three separate decisions.
At level 4 the decision looks like this:
It is possible to completely expand all decisions, knowledge models, input data and sources in one single graph, but this will most likely result in a diagram that is not usable for any type of audience. Therefore it is advised to expand sub decisions in separate DRG's. Shown below is such a DRG for the sub decision Risk score bonus.
Runtime Decision Requirements Graph
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