The principles of design of instructional materials for English for Specific Purposes (ESP) to be taught in a non-English-speaking country are outlined, and the development of materials for an Indonesian program is described. ESP materials design is tied closely to the specific subject areas of language use and the types of learners addressed. Content must address both vocabulary and linguistic structures typical of the register to be used in the subject area. ESP materials currently available have typical patterns of organization, depending on the publisher and intended use. Materials developed for an English language program in Indonesia have four components: a basic English curriculum at four levels, consisting of pre-reading information, reading passages, structure review, vocabulary, dialogue, and pronunciation review; an English correspondence component at two levels; oral English at four levels; and an advanced language segment. A 23-item bibliography is included. In these materials, the vocabulary component is central, with review and expansion of discourse structures appropriate to the course level. (MSE)