A scene occurs at a specific time and place. When there is a leap of time or a new setting, there is a scene change. If you find yourself summarizing or generalizing about what your characters say or do, then you are writing exposition and not a scene. “She had a great time at the party”—is a type of summary. It should either be developed into a scene, ( letting the audience experience the great time she is having at the party) or it should be dropped altogether. The bridges and transitions come in during the writing not during the scene setting. In the planning stages, just view your story as a series of developed scenes—a slide-show of the novel.