The Philadelphia City Schools engaged in a four-year program to develop and test dual audio television, a way to help children learn more from the massive amount of time they spend watching commercial television. The format consisted of an instructional radio broadcast that accompanied popular television shows and attempted to clarify and amplify the vocabulary and word concepts that were introduced. The power of the dual audio was that it piggy-backed on an already existing delivery system, but difficulties derived from attempting to inject educational content into formats that were in many ways inimical to good teaching practice. Research revealed that certain methods of presentation were more effective than others, but the overall results were disappointing. (EMH)