Since 1993, New Zealand has used the Mixed Member proportional representation system. On November 26, New Zealand holds a national parliamentary election, and also votes on whether to keep MMP or shift to another system. Here is an Australian newspaper article that describes the current system and the upcoming referendum.
To help New Zealand voters decide which system they prefer, election officials have prepared this neutral explanation of each type of system, and even provide a flow chart to help anyone decide, based on that individual’s values. See it here. Thanks to Rosa Barker for the link and the news. Although the election is more than two months away, most observers expect that New Zealand voters will retain the existing system.