Bargaining often starts with agreement on ground rules. These rules typically provide for the extension of the agreement subject to termination on notice.The government forces employers to recognize labor unions and negotiate with them in a process called "mandatory collective bargaining. Employers have a legal duty to bargain in good faith with their employees' representative and to sign any collective bargaining agreement that has been reached. Identified as a union communication in the subject line, and must be of a reasonable size, volume, and frequency.