I was wondering how common it is to co-write something. Back in sixth grade, when I first started getting into writing, I would co-write stories with my friends. At first we would brainstorm together, and write together. Then we decided we would do "you write a chapter, I write a chapter". It was really fun, even though we didn't get that far, but I was wondering how many other people have tried this (or something like this) and what your thoughts were on it.