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The optional referendum (German: Fakultatives Referendum; French: Référendum facultatif) is an instrument of direct democracy in Switzerland. It allows citizens to oppose to laws voted by the parliament. A votation will be organised for every law that collected 50,000 valid signatures of opponents.
It is different from the mandatory referendum in that a collection of signatures is necessary to organise the referendum.
- Vincent Golay and Mix et Remix, Swiss political institutions, Éditions loisirs et pédagogie, 2008. ISBN 978-2-606-01295-3.
- (French) Horizons, magazine of the Swiss National Science Foundation and the Swiss Academies of Arts and Sciences, no. 99, 2013, p. 45.