There is increasing interest in objective assessment of surgeon competence. In the field of otolaryngology, several surgical training programs, including The Ohio State University, the University of Toronto, and Stanford University, have pursued standardized criteria to rate their trainees' performance in the initial steps of temporal bone dissection (complete mastoidectomy with facial recess approach). Although these assessment metrics require the completion of similar basic components integral to successful temporal bone dissection, certain listed criteria are unique to each institution. Our aim was to establish a more standardized set of criteria that can be used across different institutions to objectively assess temporal bone dissection. We translated these new criteria into automated metrics in our temporal bone dissection simulator to achieve even more objective grading of temporal bone dissections.