Instructional radio is a relatively low cost technology which can deliver effective educational programs to any school capable of receiving broadcasts, however remote the school might be. This paper explores the Radio Language Arts Project (RLAP), an application of instructional radio technology to the teaching of English as a foreign language. The advantages and disadvantages of the use of radio in education are noted, and successful realizations of radio's potential in Kenya and Nicaragua are described. The subject matter, English, is analyzed from the perspective of the Kenyan curriculum and the radio medium. The most significant instructional design principles used by the RLAP are enumerated. These are: more intensive use of radio and for longer periods, cost control, systematic instructional development, provision for distributed learning and immediate reinforcement, and the teacher/radio partnership. Finally, the formative and summative evaluation strategies for the RLAP are described and the project's implications are considered. (Author/AMH)