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Chapters should reflect the sequence or flow you are looking for. Keep the reader interested enough to want to actually read the next chapter. Some books almost want you to "skip" a chapter.
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/42918 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/