Teaching technical writing to non-native speakers of English is complicated by their special needs. Central to the discussion is the idea that expository writing ought to be a key element of any program purporting to teach English. The nature of proper preparatory training is discussed with specific reference to the language groups American trainers are likely to encounter working in the U.S. or abroad. The justification for specific practices is discussed and should enable instructors to develop further strategies for training. Once the preparatory work is completed, effective technical writing instruction for non-native trainees requires modification of a good program for native speakers. Training is most effective if material is presented in culturally familiar and intellectually compatible ways.