What are the principles of bargaining, the procedure for collective agreements and the representation of the parties to the negotiations? Generally speaking, there are four important methods of collective bargaining, namely negotiation, mediation, conciliation and arbitration to resolve commercial disputes. In this context, R.F. Hoxie stated that arbitration proceedings are often provided for in collective bargaining under certain contingencies and for certain purposes, particularly when the parties fail to reach an agreement, and in the interpretation of an agreement by negotiation. . . .