Short-time energy vs frequency spectra of stop bursts, and formant transitions in the adjacent vowel have been studied. Sound segments consisting of burst or transition alone were submitted to listeners for identification. Results are discussed with the aim of developing possible identifying criteria utilizing cues in the burst spectra and in the transitions. [This work was supported in part by the Signal Corps, the Office of Scientific Research (Air Research and Development Command), the Office of Naval Research, and the National Science Foundation.]