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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. For instance, if you main decision is "the amount and duration of a child care benefit" or "the fee for a small building permit" you are are actually modeling two decisions. Design them separately and reuse attributes that accommodate both decisions.
2	Sub decisions	For each identified decision, determine if the decision is preferably built up out of 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 calculation where intermediate results are never reused but are created nevertheless, for the sake of understandability.
3	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 designing decisions top-down circular references can easily be avoided.

Note

Note that a decision is not bound to be a Boolean. In general, there are three types of decisions:

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