The Standards Committee of the American Institute of Ultrasound in Medicine uum and the National Bureau of Standards (NBS) cosponsored a meeting on Pulse-Echo Ultrasonic Transducer Characterization at the NBS in Gaithersberg,Maryland, June 16, 1977. More than 100 people from both the medical ultrasound and non-destructive testing communities attended. Initiation of work on a standard for these transducers was the purpose of the meeting. A morning session of invited and contributed papers was followed by the organizational meeting of the ALUM Subcommittee on Pulse-Echo Transducer Characterization. The purpose of this paper is to discuss standardization problems of the transducer, a vitally important and often neglected portion of a diagnostic ultrasound system. A brief summary of the ideas discussed that day and the direction chosen by the committee is included.