Technological developments, which have improved and increased the audiovisual materials and mechanical aids available, can be especially useful to teachers of science, math, and foreign languages. This technology revolution is not a threat to teachers, but a source of educational tools to be used as a part of an overall teaching design. Most important to this design is an awareness of the right audiovisual aid for the right task. It is the teacher who must be able to combine conventional instructional methods with the new techniques of individual instruction and the new techniques of mass instruction. Instructional tools which have become more versatile as new uses for them have been suggested are the overhead projector and the opaque projector, as well as the non-projected resources of the classroom environment. Language laboratories have proved their effectiveness, and some can be installed simply and inexpensively. As with other instructional tools, the key value of television is its effective use in conjunction with classroom instruction. Teaching machines and programed texts, aimed at the individual's learning rate, can be used in multiple ways. Analysis of school activities suggests many opportunities for improving instructional methods which cannot themselves be separated from subject content. (SE/MT)