SCENE SLUGS

Each time the story moves to a new place, in space or time, the new setting is fixed with a Scene Slug. This is a traditional formula of three elements and sits against the left margin.
 

INT. AIRPORT GATE - DAY

or

EXT. AIRPORT RUNWAY - NIGHT

or

INT. AIRPORT TERMINAL, BAGGAGE AREA - NIGHT

SETTING: The first element is the setting which is the Setting which is either interior "INT." or exterior "EXT." Anything enclosed is interior including a car or truck. Anywhere the characters are exposed to the elements on all sides is exterior.  Words like "SIMULTANEOUS" and CONTINUOUS" are meaningless and should not be used.

LOCATION: After a double space comes the second element: the Location. This is a quick and descriptive title for the location. It should very briefly describe the room or type of place and, if needed, tell us the owner or character associated with the place. A BEDROOM is not as good as AMY'S BEDROOM. Try to be consistent through the screenplay so that GRANNY'S PARLOR doesn't become ABBIE'S LIVING ROOM at some point. Consistency keeps thing simpler, allows the reader to concentrate on the story.  You can also use a comma to better define a place if you spend a lot of time there so: AMY'S APARTMENT, BEDROOM and AMY'S APARTMENT, KITCHEN become very distinct.  This prevents the reader from forgetting where they are.

TIME OF DAY: Lastly, after a space-dash-space (" - "), comes the third element: the Time of Day, which is usually limited to "DAY" or "NIGHT." Only if it is absolutely necessary to the meaning of the story should you use "DAWN" or "SUNSET." Anything more specific than these should appear in the scene description.

It's called a Scene Slug because it is a mechanical device. Used properly, it is unobtrusive and the reader will, as the script goes on, breeze past it and concentrate on the story instead of the format.

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