If you're an contractor that works with or for the U.S. Government you've almost probably dealt with FAR also known as the Federal Acquisition Regulation. This dense legal document governs the rules, rules, and regulations that both Government agencies as well as prime contractors must adhere to when working together. https://far1581355.elbloglibre.com/17194150/documenting-negotiations-in-accordance-with-far-15-406-3