1. A method, comprising: identifying a first attribute in a source code of a deep question answering system; computing an influence score for the first attribute based on a rule in the source code used to compute a confidence score for each of a plurality of candidate answers generated by the deep question answering system; computing an importance score for the first attribute based at least in part on the computed influence score; and upon determining that the importance score exceeds a predefined threshold, storing an indication that the first attribute is an important attribute relative to other attributes specified in the source code.