The bug-assignment problem is commonly stated as a method of evaluating developers according to their ability to fix a specific bug. Previous methods in the field used machine-learning or information-retrieval techniques and used textual aspects of bug reports as evidence of developer ability to assign a score to each developer and arrange the developers for each bug report. Despite the subject's relevance and the considerable attention it has received from researchers, it remains a difficult and time-consuming effort in major software projects. Even now, there is no consensus on how to validate and compare bug-assignment procedures, and many approaches documented in the literature are not repeatable.