A referendum on the MMP voting system will be held at the same time as the 2011 general election, Justice Minister Simon Power announced today.
The referendum fulfils a National pre-election promise.
It will ask two questions: whether voters wish to change the voting system from MMP and what alternative voting system they would prefer, from a list of options.
A second referendum may be held later to decide which system to go with.
"Cabinet will be making further decisions in the next few months, including drafting the questions included in the first referendum, the alternate electoral systems to be offered, and how that referendum will be conducted. These decisions will be announced once they are made," Mr Power said.