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1.20.1.2. Changes at the request of the employerThe LFT establishes that the employer can request the change when economic circumstancesoccur that justify it (Article 57, Paragraph 2).The terms and conditions of work may also be changed by agreement, which must beapproved by the Conciliation and Arbitration Board, as long as it does not contain anywaiver of the workers’ rights. Otherwise the authority will not approve the agreementsince such rights are unwaivable.96C H A P T E R V1.20.2. Effects of the changesOnce both the worker and employer are in agreement, both parties must comply withthe changes. If the change is made through a procedure before the Conciliation andArbitration Board, the parties will be bound by what the authority has resolved. Thus,once the authority has issued its resolution or the worker and employer have manifestedtheir agreement, the change will become effective.2. Unions and Collective Bargaining AgreementsThe union is the association of workers or employers organized for the study, improvement,and defense of their respective interests.In turn, the collective bargaining agreement is the agreement executed between one ormore workers’ unions and one or more employers or one or more employers’ unions forthe purpose of establishing the conditions under which the work of one or more companiesor establishments will be performed.2.1. Structure and Operation of the UnionsLegally formed unions, that is to say those that are registered, are legal entities with legalcapacity to acquire personal and real property to be used immediately and directly forthe purpose of their formation, and to defend before all the authorities their rights andexercise any applicable actions. Unions have two types of elements that are essential fortheir formation.2.1.1. Substantive elementsa) To be workers or employers, depending on the union;b) The minimum number of employers necessary to form an employers’ union isthree (Article 364, LFT);c) The minimum number of workers necessary to form a workers’ union is 20 inactive service (Article 364, LFT). In addition, workers considered in active servicefor purposes of forming the union shall include those whose employment has been