After a union is certified or recognized, the employer "will be required to bargain with the union about all mandatory subjects, e.g., wages, hours, and other t

After a union is certified or recognized, the employer "will be required to bargain with the union about all mandatory subjects, e.g., wages, hours, and other terms and conditions of employment. "You are required to bargain over mandatory subjects in good faith, which includes the duty to provide relevant information to the union upon request and to refrain from unilaterally changing any of those terms and conditions without first notifying the union and bargaining with the union to lawful impasse. The duty to bargain in good faith does not mean, however, that you must reach agreement with the union on any proposals; rather, it merely requires you to approach bargaining with an open mind and desire to reach agreement, and that, if you reach an agreement, to sign the resulting written document. "You may also choose to bargain with the union about permissive subjects, which is anything that is not mandatory or unlawful."