A deeper look at tinnitus retraining therapy and how it works. We go over the Tinnitus Primary Function Questionnaire (The University of Iowa, Department of Otolaryngology – Head & Neck Surgery. Tyler, R., Ji, H., Perreau, H., Witt, S., Noble, W., & Coelho, C. (2014). Development and validation of the Tinnitus Primary Function Questionnaire. Am J Audiol, 23, 260–272) and how these types of questionnaires are used clinically.