In Story Engineering, Larry Brooks writes, “A concept, it could be said,…is something that asks a question. The answer to the question is your story.” The best concept questions are “what if” questions.
A concept should be compelling. At least to you. Why do you want to write? Is it to exercise your writerly skills, or because you have a story you are dying to tell?
Homework: Write your story idea in the form of a “what if” question. What follow-up questions does it inspire? This can be the launchpad for an outline.