1. A decision-tree system comprising: a data store having structured data comprising a decision tree; an additional data store having a record to be analyzed according to the decision tree; a distinction module operable to select between multiple paths extending from a node in the decision tree based on a unit of data from the record, the unit of data carrying information relevant to a distinction of the node, the distinction module further comprising a real-value module operable to make a first comparison between the unit of data and a predetermined real value for the distinction of the node, and a set-value module operable to make a second comparison between the unit of data and a predetermined set value for the distinction of the node; and the distinction module further operable to select a path from the multiple paths based on at least one of the first comparison and the second comparison.