The approval voting is a one round voting system. Each person select as many choices as he/she want : none, one, several, all, but never two times the same. The winner is the choice that has the greater number of votes.
This method is simple and easy. In Pollen, it is possible to limit the number of choices, this permits to switch from the first-to-post voting (only one choice) to approval voting (no limit of choice). This invites voters to vote sincerely.
