Background whispering may greatly interfere with the ability to hear a classroom lecture. The glare from behind you makes it difficult to read lips and other facial expressions. Overhead and opaque projectors are often a good substitute and allow you to face the class while writing. Notices of class cancellations,assignments, etc., can be put in writing or on a chalkboard to insure understanding. Whenever new materials will be covered which involve technical terminology not in common usage, if at all possible supply a list of these words or terms in advance to the student and interpreter.
Unfamiliar words are difficult to speech read or interpret.
The use of visual media may be helpful to deaf individuals since slides and videotaped materials supplement and reinforce what is being said. This needs to be taken into account as the presenter uses visual aids. Closed-captioned visual aids such as films and videos are extremely helpful. If appropriate, foreign language films with English subtitles are also useful.