National features both regional and electorate-level organisational structures. National traditionally had a strongly decentralised organisation, designed to allow electorates and the five regions to appeal to the unique voter base in their area. However, in light of the 2002 election result, in which the party suffered a significant loss of its support base, a review of the party organisation resulted in decisions to weaken the regional structure and to implement a more centralised structure. The restructuring was ostensibly planned to make the party organisation more "appropriate" for the mixed-member proportional electoral system, where votes are cast for a countrywide party list.