Scorporo

Scorporo (Italian: [ˈskɔrporo], lit.'parceling out') is a partially compensatory, mixed-member majoritarian electoral system, sometimes referred to as a negative vote transfer system[1] (NVT) whereby a portion of members are elected in single-member districts (SMDs) and a portion are elected from a list. It may be fully defined as a parallel voting system which excludes a portion (up to 100%) of the SMD winners' votes in electing the proportional tier, to result in a more proportional outcome. The exclusion of a portion of the SMD winners' votes is what makes scorporo fundamentally different from parallel voting and somewhat closer to the additional member system in the UK (a form of mixed-member proportional representation) in theory. However, the design proved particularly susceptible to the decoy list strategy, and as a result by 2001 had devolved into a de facto parallel voting system. The scorporo method is only known to have been used in Italy, but a similar version is in used for the National Assembly of Hungary.

  1. ^ Ferrara, F (2004). "Electoral coordination and the strategic desertion of strong parties in compensatory mixed systems with negative vote transfers". Electoral Studies. 23 (3): 391–413. doi:10.1016/S0261-3794(03)00028-3.