The document provides guidance on developing fictional characters and their dialogue for scriptwriting. It suggests that a character's traits can be shown through 10-15% of direct information given, 20-25% deduced, and 60-70% left unknown. Characters should have easily identifiable traits and be defined through physical, sociological, and psychological components. Dialogue must characterize speakers, move the story forward naturally, and show emotion over exposition. Non-verbal actions can often replace words to effectively develop characters on screen.