Outlining and planning play a crucial role in book writing. They serve as a guide for the writing process. An outline is a blueprint for the book. It helps provide structure and organization. It helps in arranging one's thoughts and ideas in a coherent manner. You are able to catch any inconsistencies or loopholes present. Outlining helps to develop the story's characters and plot. It allows readers to stay interested in the story from the beginning to the end. You are able to properly write details about the major events, conflicts, and resolves.