For any change in the constitution, a referendum is mandatory (mandatory referendum); for any change in a law, a referendum can be requested (optional referendum). In addition, the people may present a constitutional popular initiative to introduce amendments to the federal constitution.
For any change in the constitution, a referendum is mandatory (mandatory referendum); for any change in a law, a referendum can be. requested (opti!onal referendum). In addition, the people may present a constituti,onal popular initiative to introduce amendments to the federal constitution.