Videotapes are not two-way. Unless special provision is made for an individual to respond, the viewer watches a message without being able to give feedback and without hearing opposing views. Thus, a tape should include a means of contacting staff or obtaining additional information. Some cable television stations use interactive techniques, including playing a video and allowing responses from viewers by telephone. Video viewers are basically self-selected.
Access is limited to viewers with a playback machine.
Special attention should be given to the needs of people with disabilities. Interpreters may be needed to make the information available to individuals with hearing disabilities. Text must be sufficiently large so people with sight disabilities are able to read it. For the blind, narration should be sufficient to explain the mate rial even though it cannot be seen. Video techniques are rapidly changing.