On May 11, 2010, the Federal Register will publish the Final Rule of the National Mediation Board (NMB) regarding the process it will employ in determining the outcome of representation elections. When the rule goes into effect, it will replace the NMB's historic majority rule, under which a majority of the entire craft or class had to vote for representation before a union would be certified to represent that craft or class, in favor of a process that is based on the majority of votes cast.