Aspects include identifying, for a set of decision rules, one or more decision rules missing from the set of decision rules, the one or more missing decision rules satisfying a set of limitations. A decision rule determines whether a decision is made for a case, and a limitation determines the cases for which a decision should be made. A constraint graph that represents the cases for which no rule of the set of rules makes a decision, and for which all limitations of the set of limitations are satisfied, is built. A missing case represented by the constraint graph is created, and a family description is created from the missing case. The family description is a set of cases for which no rule of the set of rules makes a decision. The one or more missing decision rules are then constructed from the family description.
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