Standard techniques in audio description

At the very least, the field of audio description needs general techniques. This list of techniques is offered as something an organization like Audio Description International could adopt or ratify in the way international conferences adopt or ratify statements or resolutions. The adoption would be nominal and non-binding, with no enforcement mechanism. In effect, adopting the techniques would act as a gesture, an indication that audio description is actually rule-governed and is not self-explanatory and that the nascent audio-description industry can agree on baseline measures.