The document discusses instructional television (ITV), which uses television programming to support formal classroom instruction and enrichment programming. ITV programs are typically 15 minutes long and accompany teachers' guides. While early efforts struggled, ITV is now used successfully in various contexts. It is most developed in open university systems like the UK Open University. ITV combines formal lessons with supplemental materials and exams for adult learners. New technologies like satellites, teleconferencing and interactive features have enhanced ITV's potential to provide global education opportunities.