Correspondence between behavioral tonal responses and objective measures of physiologic function is also important to consider as part of the cross-check battery approach. In their original article, Jerger and Hayes (1976) emphasized the importance of impedance audiometry and auditory brainstem response in confirming behavioral test results. In addition to these cross-checks, otoacoustic emission (OAE) testing currently plays a significant role in the test battery approach. Figure 1 shows the audiometric results obtained in a one-year-old child with developmental delays. Distortion product otoacoustic emissions (DPOAEs) were obtained for both ears, with amplitudes within the range typically obtained for normal ears ( Gorga, Neely, Ohlrich, Hoover, Redner, & Peters, 1997 ). Ipsilateral acoustic reflexes were present at 90 dB HL, 500–4000 Hz, bilaterally. The child's speech detection threshold (SDT), obtained in the sound field, was 25 dB HL. The SDT was 20 dB better than the best response to narrowband noise (NBN), suggesting that responses to the NBN were MRL. For this child, poor inter-test reliability and cross-check physiological measures, acoustic reflexes and DPOAEs, were both critical to the interpretation of the audiometric results and subsequent recommendations. DPOAE amplitudes, consistent with those obtained from normal ears, indicate good function of the outer hair cells in both cochleae. The presence of