Review your story again, checking each sentence to insure it’s structured correctly and pulls its own weight. Is the information conveyed clear and concise? Is wordiness an issue? Have you avoided adverbs and adjectives whenever possible, i.e. did the boy “run quickly through the woods,” or did he “sprint through the woods?” Did you vary the lengths and patterns of your sentences to avoid repetition? Do they reflect the true order of the way things occurred? If some sentences were omitted altogether, would anything crucial be lost? Once you’re confident all of these issues have been addressed you’re ready to proceed to the fourth draft.