Aerospace engineers and scientists from Western Europe, Japan and the USA were surveyed as part of the NASA/'DoD Aerospace Knowledge Diffusion Research Project. Questionnaires were used to solicit their opinions regarding (1) the importance of technical communications to their profession, (2) the use and production of technical communications, and (3) their views about the appropriate content of an undergraduate course in technical communications. The ability to communicate technical information effectively was very important to the aerospace engineers and scientists who participated in the study. A considerable portion of their working week is devoted to using and producing technical information. The types of technical communications used and produced varied within and among the three groups. The type of technical communications product used and produced appears to be related to respondents' professional duties. Respondents from the three groups made similar recommendations regarding the principles, mechanics, and on-the-job communications to be included in an undergraduate technical communications course for aerospace majors.