Other than parenting, I can’t think of anything else that is more difficult for two people to share than one writing project. But when it’s done right, when everything works, the results are amazing. I've had the pleasure of collaborating with several other writers over the years, mostly on screenplays but also on a couple of books, and they have all been satisfying experiences. Craig Wargo was the first writer I worked with on screenplays, and we wrote several during the years we worked together. In the course of our writing partnership, we came up with these tips for a successful collaborative effort as a handout for a workshop we presented at a film conference. While writing fiction, both writers must have an equal understanding of the plot, the characters, and the character arc. That will avoid costly mistakes later. Both writers must have the same vision for the direction of the story. Otherwise it would be like two people trying to get to a destination while...