1. A method for inferring problem data from bug repositories, the method comprising; identifying a plurality of phrases that are repeated in a bug report; selecting a first phrase from the plurality of phrases to keep and a second phrase from the plurality of phrases to drop based on a meaning of the first phrase being greater in significance in the bug report than a meaning of the second phrase; mapping the first phrase to one or more of a plurality of classes of an ontology model associated with the bug report, the ontology model defining valid interactions between the plurality of classes; determining whether the first phrase corresponds to a valid interaction defined by the ontology model; and based on determining the first phrase corresponds to a valid interaction in the ontology model, generating an output corresponding to the mapping for use in analyzing the bug report.