Action Line

Describing the Sights and Sounds

Action lines, also known as scene description, are the prose of a screenplay. They are everything that is not a slugline, a character cue, or dialogue. Their function is to describe the setting, the characters’ physical movements, their significant expressions, and any important sounds. Action lines are the primary tool for visual storytelling, painting a picture of the scene in the reader’s mind and providing a blueprint for the director and production team.

Writing effective action lines is a unique skill that balances evocative description with extreme brevity. Unlike a novel, a screenplay cannot delve into a character’s internal thoughts or feelings. Action lines must describe only what can be seen or heard by the camera and microphone. The goal is to create a vivid experience for the reader while keeping the page clean and the story moving forward. Overly long, novelistic paragraphs of description are a common sign of an amateur script.

The Rules of Writing Action Lines

To maintain clarity and adhere to industry standards, action lines follow a few strict rules.

• Always in the Present Tense: The story is described as it is happening right now. For example, “Jane walks to the window and looks out at the rain,” not “Jane walked to the window and looked out at the rain.” This creates a sense of immediacy and makes the script feel active.

• Show, Don’t Tell: This is the golden rule of screenwriting. Instead of telling the reader a character’s emotional state (e.g., “Jane is sad”), the action line must show it through physical action (e.g., “Jane’s shoulders slump. A single tear rolls down her cheek.”).

• Capitalization for Emphasis: Specific elements are capitalized within action lines for emphasis and to draw the attention of the production crew:

  • Character Introductions: The first time a character appears, their name is written in ALL CAPS (e.g., “JOHN WICK (40s), intense and focused, enters the room.”).
  • Key Sounds: Important sound effects are often capitalized (e.g., “The engine ROARS to life. A gunshot CRACKS in the distance.”).
  • Important Props or Actions: Sometimes a writer will capitalize a crucial object or action to ensure it is not missed (e.g., “He places the glowing CRYSTAL on the pedestal.”).