"Telesecundaria" has for the past six years attempted to provide secondary education (grades 7-9) by television to those students who would normally not be able to continue their education beyond the primary level. The study reported here aimed to evaluate the system, especially its cost-effectiveness, suggest strategies for improvement, and make Mexico's experience available to other nations wishing to use technology to expand education opportunity. Characteristics of the Telesecundaria system, the evaluation methodology, costs of the television and conventional systems per pupil, the ability of the two systems to satisfy educational demand, the results in terms of student learning and attitudes, and some general conclusions and strategies are reported. (Author/RH)