Only people with Andorran nationality and over 18 years old are eligible to vote and to become a candidate.
Half of the seats are elected in two-member constituencies based on the seven parishes, with a plurality party block voting method.
The remaining 14 are elected in a single nationwide constituency by proportional representation with closed lists.
The other half of the seats are allocated with proportional representation using the largest remainder method, with Hare quota (including the winning party).
In 1866, a social revolution ended with the promulgation of the New Reform (Nova Reforma) by the Co-princes of Andorra.
In 1982, a multi-option referendum was held in order to change the election system.
In 1993, with the adoption of the new Constitution, Andorra ceased to be a feudal country and a new electoral law was made.