The Guild provides a unique service to the entertainment industry in determining writing credits. The system for determining writing credits has been developed over several decades by writers for writers. The purpose of this information is to provide writers with a plain language guide to the credits determination process and practical tips writers should know to help protect their interests in credits. This guide is not a substitute for the Credits Schedules of The WGA Theatrical and Television Basic Agreement (MBA), or The Credits Manuals, and is not intended to, and does not, alter their provisions in any way.