[header] How to write a book with another person [title] Decide who you're going to write the book with. [step] It should be someone you get along well with, someone who likes to write, and someone who has a similar writing style to yours. Pick somebody that is open to new ideas and isn't bossy. 
You need a person you can trust and who you'll want to share your ideas with. [substeps] Find someone you can discuss ideas with easily and who values your opinion.