In unionized firms, Article 251 of the Labor Code stipulates that “it shall be the duty of the employer and the representatives of the employees to bargain collectively in accordance with the provisions of the Labor Code.” The duty to bargain collectively, in the following Article 252, means “the performance of mutual obligations to meet and convene promptly and expeditiously in good faith for the purpose of negotiating an agreement with respect to wages, hours of work and all other terms and conditions of employment, including proposals for adjusting any grievances or questions arising under such agreements, if requested by either party, but such duty does not compel any party to agree to a proposal or to make any concession.” The resulting contract is called the Collective Bargaining Agreement (CBA) and is effective for five years.