According to Walter Murch, when it comes to film editing, there are five main criteria for evaluating a cut or deciding where to cut. They are (in order of importance, most important first, with notional percentage values.):
Emotion (51%) — Does the cut reflect what the editor believes the audience should be feeling at that moment?
Story (23%) — Does the cut advance the story?
Rhythm (10%) — Does the cut occur "at a moment that is rhythmically interesting and 'right'" (Murch, 18)?
Eye-trace (7%) — Does the cut pay respect to "the location and movement of the audience's focus of interest within the frame" (Murch, 18)?
Two-dimensional plane of the screen (5%) — Does the cut respect the 180 degree rule?