Aldo Tragni invented the following systems:
- FAIR-V: currently the most supported by him for single-winner system, with approval ratings.
- PRO-V: currently the most supported by him for single-winner system, with proportional ratings.
- Distributed Voting System (DV): currently the most supported by him for multi-winners system.
- WIRV
- Tragni's method (and variants)
- Distributed 2-Voting (D2V)
- Distributed Multi-Voting (DMV)
He defined:
- Symbolic voting systems
- Proportional vote philosophy
- Honesty criterion
- IWA
- Independence of least/most preferred
- MV Norm
- nV Norm
He has made:
- This site (beta version), where it's possible to create surveys that use Distributed Voting with range [0,9] for single and multi-winners.
- This Codepen Application (beta version, fork from this), with which it is possible to insert ballots and view the single-winner with various voting systems.
He also contributed to some voting systems, creating the following diagrams that explain the procedure in a simple way:
Other diagrams: