“…With the adoption of proportional representation (using the single transferrable vote method, PR-STV) in federal and state upper houses over the period from 1949 to 2006, minor parties used the decreased threshold for representation that this presented to gain representation in these chambers (Deschouwer, 2006: 6). While Australia's version of symmetrical, elective bicameralism has had major consequences for the style of parliamentary government, and has provided opportunities for minor parties to have a significant influence on parliamentary politics (Mulgan, 1996;Sharman, 1999), upper house elections are not linked to the formation of government. To that extent, and reflecting the wide variation in the institutional characteristics of these chambers, the party systems of upper houses are distinct from those of lower houses.…”