Script experts:
How do you tackle this?
For example, 3 teenage blokes are introduced into a scene and are called Teenager 1, Teenager 2 and Teenager 3. Later on in the script their names are revealed. Do you then refer to them with their real names or maintain the Teenager 1,2,3, thing?
Start off by calling them by their real names.
What he said.
Never change name tags in a script is the age-old rule. It really pees off the reader. 
What they said.
What he said. Him, not him.
A script is not a STORY!
It is a set of instructions to a production team and to actors.
As such it is essential that the actors and continuity staff and wardrobe staff and director and etc etc, know immediatley which person is at a given point in the script and what they are wearing etc. So you do not change name tags, even if the name changes in the dialogue.
You are not trying to write a who-dunnit for the producer's script readers.
Quote: al_gernon @ May 6 2008, 9:15 AM BSTScript experts:
How do you tackle this?
For example, 3 teenage blokes are introduced into a scene and are called Teenager 1, Teenager 2 and Teenager 3. Later on in the script their names are revealed. Do you then refer to them with their real names or maintain the Teenager 1,2,3, thing?
When Characters are first mentioned in the stage instructions, the name is all capitals and generally followed by a very brief description. The name does not need to be in all caps in further mentions, but often is.
e.g.
TOM (teenager, short, causican, hooded jacket) gets off his bike, followed by DICK (teenager black, sweat shirt) and HARRY ( teenager asian, in running gear).
The reason for this is so that the casting team, can easily make a complete list of characters (to start choosing actors) and the wardrobe team can start to prepare list of clothing and props etc etc.
Mention only characteristics that are essential to the 'plot' or needed to set any essential tone of the scene, give the director and the casting teams their freedom of choice.