Character or plot tension curve from setup to resolution — defines direction and turning points. The script's backbone.
You're in the edit suite, looking at the dailies, and you realize: the scenes might be formally connected, but they lack an internal rhythm. That's the story arc — not the external sequence of plot points, but the emotional and dramatic curve that spans a character or the entire story from the first frame to the last. It defines not just what happens, but why it's relevant to the audience.
The story arc begins with exposition — the character's zone of comfort, their status quo. Then comes the inciting incident that disrupts this balance. From there, you build tension: through conflicts, obstacles, false hopes. On set, you notice this in the direction: the actor must have a goal within each scene that fits the overall curve. A line of dialogue at minute 45 shouldn't be at the same emotional level as one at minute 10. The camera, the movement, the lighting — everything follows this invisible line.
The turning point (or points) is the breaking strain. Here, not only the external situation changes, but also the character's internal attitude or our expectations as viewers. In the edit, you often realize: a scene that doesn't work in isolation makes sense if it serves as a catalyst for this turn. The resolution doesn't just bring the end, but a new balance — different from the beginning, earned or lost.
In practice, you need multiple story arcs: the protagonist's main arc, often one or two sub-arcs. These must correspond rhythmically with each other. If all characters reach their peak at the same time, it feels artificial. Interweave them: the antagonist escalates while the hero still doubts. This creates real tension. At the writing desk — or when discussing the edit sequence with the director — you like to map out these curves. Which scene raises the tension level? Which deliberately relieves it? A strong story arc also allows you to cut scenes without breaking the story — because every scene must contribute to the curve, not just to the plot chronology.