Figure 2: Diagnostics and assessment instruments are applied at different points and times in the treatment course. In comparison of the time course (pre- and postoperative) data related to audiology and the quality of life have a good assessment quality while imaging can be used with different questions throughout the whole process. Assessment instruments that integrate the patient’s history as well as intraoperative findings in order to evaluate the individual risk profile and the probable success, combine pre- and postoperative data. Classic instruments for the standardized, but merely intraoperative assessment and documentation are the classifications described by Wullstein [1] and Austin-Kartush [40]. The intraoperative real-time feedback is a new procedure to generate statements on the acoustic reconstruction quality.