List of electoral systems
An electoral system is a set of rules that determine how elections and referendums are conducted and how their results are determined.
Some electoral systems elect a single winner, while others elect multiple winners, such as members of parliament or boards of directors.
The study of formally defined electoral methods is called social choice theory or voting theory, and this study can take place within the field of political science, economics, or mathematics, and specifically within the subfields of game theory and mechanism design.
List of electoral systems by types
Key
- Name and other names of the system '
- Type of representation: the most common division of electoral systems
- * Winner-take-all system : includes all single-winner systems; no guaranteed minority representation
- * Proportional representation
- * Semi-proportional representation
- * Other: sortition, etc.
- Mixed system : A systems composed of multiple other electoral systems, usually containing at least one proportional and one winner-take all system.
- * Superposition/parallel voting
- * Coexistence
- * Fusion
- * Correction
- * Conditional
- * Supermixed
- Single-winner/multiple winner system
- List / candidate based system
- Type of ballot
- * single choice
- * multiple choice
- * cumulative
- * ranked
- * score
- Decision rule
- * No quotas
- ** Plurality
- * Quota
- ** Notable quotas
- *** Absolute majority
- ** Multi-round voting (common supplemental method to using absolute majority
- * Pairwise comparisons
- ** Simple majority rule
- * Other
- ** Randomization
- Number of votes/voter
- Number of tiers:''' number of levels e.g. local, regional, state, national
Systems