In England, local authorities are required to adopt one of three types of executive arrangements, which govern how decisions will be made within the council. Before the adoption of the Localism Act 2011 there were two principal modes of executive arrangement. They are the "leader and cabinet" and "elected mayor and cabinet" models. A third option "elected mayor and council manager" was withdrawn in 2007. Since 2012, principal authorities have been allowed to return to the "Committee system".