Proportional Seat Distribution (PSD) is a new voting system that ensures the representation of political parties matches their voter support as closely as possible. Originally designed to be implemented in federal and provincial parliaments of Canada, PSD can be used to elect members for any manner of representative houses (such as assemblies, parliaments, congresses and senates) where party dynamics play a role and each representative is expected to represent a specific electoral district.

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PSD uses the results of electors' votes to create a representative assembly where every electoral district ("riding" here in Canada) has a local representative and where a party's membership directly reflects its percentage of the vote. Local representation is especially valued by Canadians who want to ensure their specific local views and issues are voiced in a vast country of diverse environments and communities. 

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Unlike other proportional voting systems, to provide proportional results PSD does not require extra representatives (unlike MMP) and does not require bigger electoral districts (unlike STV and R/U-PR). PSD respects district boundaries as they are, so it's really easy to implement wherever there are already electoral districts. 

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PSD is super simple for voters. They all just mark an X beside their candidate (unlike AV, MMP, STV and R/U-PR). When voting in a district where a specific party is strongly favoured, each vote still counts. When someone votes for a party candidate who does not get the seat for the district, that vote still helps the party get a seat in another district. When a party candidate receives votes well beyond what was necessary to get the local seat, those extra votes still help the party get a seat in another district. Because parties receive seats by popular support, all votes for a party, regardless of where they are cast, contribute to the party's representation in the elected assembly.

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PSD also offers versatility in ensuring proportional results. For instance, in national elections PSD can be applied across the whole country, giving results that optimize proportionality to the national popular vote, or PSD can be applied separately to regions of the country (like states, provinces, territories, prefectures, cantons, or any number of electoral district groupings) to ensure that representation is proportional at the region level.