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There seem to be two general approaches to this: One person writes the work, and the other starts revising it heavily. There might be significant problems that the second author needs to address...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/5969 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
There seem to be two general approaches to this: - One person writes the work, and the other starts revising it heavily. There might be significant problems that the second author needs to address. There might be significant expansion of the work. - Both authors agree on a general outline or plan, and they map out the work, indicating who will write the first draft of what sections. These sections could be anything from significant fractions of the book to individual scenes. In either case, the collaborators will smooth out stylistic differences in a round of revisions.