If you're an contractor that works with authorities from U.S. Government you've almost definitely dealt with the FAR, or the Federal Acquisition Regulation. This dense legal document regulates the rules as well as regulations that both the government and prime contractors must adhere to when working together. In this article https://donovanycccb.suomiblog.com/documenting-negotiations-in-accordance-with-far-15-406-3-31876759