Unaided audiometric thresholds will be obtained for each ear, using insert earphones when possible. Thresholds will also be obtained using the standard audiometric technique conditioned play audiometric (CPA) techniques, visual reinforcement audiometric (VRA) and/or behavioral observation (BOA) techniques for pure-tone air-conduction. The most appropriate testing technique will be used according to the child's age. Bone conduction testing will be completed using the above techniques. Aided audiometric thresholds will be obtained, using narrowband noise, for each ear in the sound-field using standard audiometric techniques, CPA, VRA or BOA with the speakers positioned at 45°-azimuth relative to the participant's head. Results for unaided testing must be reported for the frequencies of 250, 500, 1000, 2000, 4000, 6000, and 8000 Hz. Results for aided testing needs to be reported for the frequencies of 250, 500, 1000, 2000 and 4000 Hz.