I'm going to write the screenplay based on a friend's book. I want to ensure we both benefit from the process and remain friends. Obviously we need to write a contract. Does anyone have a sample contract to share? Have you words of experience/wisdom on your own similar collaborations to share?
Go to the WGA website. They have a standard collaboration agreement there. Adapt it as necessary so it fits your situation. Good luck.
Thank you, Mark Souza.