When one of the input cells changes, all the cells that depend on it need to react to that change — the aforementioned reactivity. In practice, though, this is the bare minimum requirement. When building reactive systems, there are usually some additional requirements we impose that make the problem harder:
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Creating Odysseus 2024 is a good introduction with budget breakdown and production details, while Machinery Behind a Clockwork Larp goes into the core loop, contingency plans, org charts, run-time checklists, and event breakdowns.