1. A method, comprising: generating a plurality of questions for an interactive decision service, each question based upon one or more conditions of a plurality of conditions, wherein the plurality of conditions are associated with a plurality of business rules; identifying, as a side effect of evaluating, by a forward changing rule engine, the plurality of business rules for outcome data, missing information corresponding to the plurality of questions; and selecting, for presentation to a user, a first question of the plurality of questions to elicit the missing information from the user.