A double majority requires approval by a majority of individuals voting, and also by a majority of cantons. Thus, in Switzerland, a citizen-proposed amendment to the federal constitution (i.e. popular initiative) cannot be passed at the federal level if a majority of the people approve but a majority of the cantons disapprove. For referendums or propositions in general terms (like the principle of a general revision of the Constitution), a majority of those voting is sufficient (Swiss Constitution, 2005).
a DOubLE majoRity RequIres approVAL BY a maJOritY OF indIvidUals Voting, anD alSo by a mAjORity of cAntonS. ThUs, In sWiTzerlaND, a CitIzen-prOPosed AMeNdmEnT to the feDERal cOnstitution (i.e. popular inItiAtive) cannoT be PasseD At the fEderAL level if A mAJorIty of the PeopLe appRove But a maJoRItY OF thE CantOns dISApProvE. foR RefErEnDuMs OR PRoposItiONs in GEneral TErmS (like ThE pRInCIPle Of a geneRal Revision of the ConstItUtIOn), A MAjority of tHoSe vOtinG is suFficieNt (swiss cOnstiTutIOn, 2005).