The flexible production process of the film allows for work to continue even without a completed script. However, enough of the story is known to begin work. I is any indication, the details and even the story will under go continual evolution well into the production process. This nonlinear approach to filmmaking is quite unique.
Most films follow a decades-old blueprint that has been around since the dawn of movies.
Typically, a film starts with a script, then moves onto pre-production wherein designs and sets are finalized. Production involves the actual shooting of the film and post-production sees the film being edited, with visual and sound effects added. In making the Star Wars prequel trilogy, these steps are not divided, and many occur concurrently. Lucas provides ideas to the art department. Their sketches and mock-ups inspire more ideas which find their way into the script.