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The first step is to work out some style guidelines among yourselves. Agree on what style you want the finished product to follow. Because this is a project among friends rather than, say, a corp...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/42932 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
The first step is to work out some style guidelines among yourselves. Agree on what style you want the finished product to follow. Because this is a project among friends rather than, say, a corporate publication, you'll probably end up including aspects of each writer's style while moving the whole thing toward a compromise center. Once you agree on what the style rules are, _don't_ each go revise your own contributions. Even with good intent, you're naturally going to favor your own style because you're so used to it. You'll miss things. Instead, revise _each others'_ parts. You might need to do this more than once. When you think you've mostly converged, look for a beta reader from _outside_ your group and see what that person notices. My documentation team has used peer editing to good effect. We already have a thorough style guide and everybody _intends_ to follow it, but there's drift. We get better results when a second person makes a pass through the work.