Automated Dialog Replacement, also known as looping or dubbing (or post-synchronization in Britain). This is the critical process in film and TV whereby dialog is recorded in a studio for any number of reasons: to replace existing production sound that is not usable either for technical considerations (usually due to a noisy location) or editorial ones (lines of dialog have been changed); to add a voice-over to a film (often planned from the outset, but occasionally added at the last moment to help clarify a hazy plot); to add group voices not covered by production sound; to record dialog for an animated production; or to dub the film into another language. It is an exacting craft that requires great teamwork between the ADR team — usually a supervisor, who helps determine which lines need to be re-recorded, an ADR "mixer," who actually runs the session, and some sort of tech assistant/recordist — and the actors. The actual work of recording ADR has not changed that much through the years. It still involves recording actors in a studio, usually (but not always) working to picture. But within that job description, there is much variety and many layers of nuance. There is the delicate art of trying to match new dialog to existing production tracks, with all their ambience, differing sonic perspectives, etc. Mic selection and placement and understanding how the dialog fits in the scene are still perhaps the most critical components of the job. There are currently 370 ADR Recordists on the media-match website.