What is included in the DVDs and are they keyed to the text? Or do they stand alone as supplemental material?
The DVDs form an integral part of the textbooks and cannot be used separately. The DVDs cannot be used as supplemental materials. Likewise, the books cannot be used without the DVDs. The books and the DVDs form a unified whole that cannot be separated without affecting the quality of the overall program. All parts of the audio and video are keyed to the text.