The Evolution of a Screenplay
The Story Script is the original story written by the Screenwriter. It is an emotional rendering in words - the introduction that conveys the emotional depth, imagery, character perspectives, the world(s), etc. The closer the Story Script is written in standard Industry format, the more likely it is to be considered as written by a Professional Screenwriter serious about their career.
The Marketing Script is the result of polishing the Story Script into a produce accepted by experienced Industry Professionals as being viable for investment. The Producer hires an experienced Screenwriter (Script Doctor) to adjust the Story Script to be concise in dialogue, action and practical matters, such as minimizing expensive dialogue/repetition, quantity of locations/scenes and other matters that would draw in (or turn away) the Investors that support production and distribution.
The Shooting Script is focused on adding the dimension of technical matters, such as lighting, set and costume design, flow of dialogue, etc. adjusted to manage all filming elements geared to quality outcomes while staying within the budget. From the moment the Director first reads the Marketing Script, their brain shifts into action to mentally disect each scene into its many components.
The Final Script is the outcome of deliberate and spontaneous changes that occurred during filming, repiecing filmed segments together during post-production edits, testing the results with audiences and obtaining final approvals from the layers of those People who invested in and greenlit the project in the first place.