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Another good way to approach your question is to consider what a short story is in terms of substance (not just length). The definition can certainly be nebulous, since it varies from writer to wri...
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Another good way to approach your question is to consider what a short story is in terms of substance (not just length). The definition can certainly be nebulous, since it varies from writer to writer. My favorite analogy comes from author Marilyn Singer who likened the short story to a photograph: a captured moment in time. She also adds that, "But while a photo may or may not suggest consequences, a short story always does." The structure of a short story is more urgent and immediate: oftentimes, an irrevocable change has occurred and a single character (or two) must confront that change in media res. In comparison, a novel can be likened to a movie. Think about why you want to turn this short story into a novel. Revisiting your reasons can help you build a foundation for a plan. It could be something as simple as: I really like my main character and I want to show more of her courage by doing X, Y, and maybe Z. So in the end, it's not a question of how much detail to add or how many more characters you need. These things come later and organically as you write. It's a really question of: what is this story truly about and why does it need the space of a novel to explore?