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Allocation All Democratic primary/caucus delegates are proportionally allocated. Republican primaries/caucuses are listed as Proportional (P), Winner-Take-All (WTA), or Winner-Take-Most (WTM).
Proportional Delegates are awarded based on the percentage of the vote received by candidates, or some formulation of dividing up the delegates
Winner Take All All delegates are given to the winner of the contest
Winner Take Most Some delegates are reserved for the winner, some may be divided proportionally.
Type
Open Voters may vote in either party primary but can choose only one
Closed Only voters registered in their respective party may vote in the party primary
Mixed A semi-open or semi-closed environment, unaffiliated voters can choose to vote in either primary or can switch registration the day of voting