Exposition, increasing action, climax, declining action, and resolution are all components of a story's narrative. An additional component is often included as well: a plot mountain. The term was coined by author John Gardner in his book On Writing Well; it refers to a scene or section of a story that rises dramatically in difficulty or intensity—usually toward a peak and then gradually declines through resolution. Every story has a rising action portion where the characters struggle with an obstacle they cannot overcome by themselves. This could be something as simple as trying to open a locked door without a key or calling for help when someone is injured. As the story progresses, the characters continue to face new challenges that grow more difficult to deal with. By the end, the problem or threat that began the story should have been resolved, or at least put into a state where it can no longer harm the characters. The climax of a story is its most intense or dramatic moment. It can be a fight scene, a car chase, a fall, etc. The climax usually includes a conflict between two opposing forces or ideas. One side must win out over the other. The resolution resolves the conflict that has been building up throughout the story.