AKA: Preproduction, Prep - Source: imdb Glossary
Arrangements made before the start of filming. This can include script editing, set construction, location scouting, and casting. See also production.
PREP, PRE-PRODUCTION - Source: John August Glossary
The period prior to principal photography in which directors are hired, actors are cast, sets are built, costumes designed, and writers work on polishes.