The National Labor Relations Act and most state statutes provide formal processes for designation and recognition of bargaining units. If a dispute arises with respect to union representation, many states direct parties to resolve these dispute with the public employment relations board in that state. After the bargaining units are organized, members may file a petition with the appropriate labor board. The labor board will generally determine that jurisdiction over the bargaining unit is appropriate, that the proposed bargaining unit is appropriate, and that a majority of employees approve the bargaining unit through an election. Several procedures are usually in place in the statute and rules of the labor board to ensure that the vote is uncoerced and otherwise fair. After this election, the labor board will certify the union as the exclusive representative of the bargaining unit. Once a union is certified, usually for a one-year period, neither employees nor another union may petition for a new election.