Decision-making of the National Council is constitutionally defined. The National Council may pass decisions if the majority of all members are present at a session. Decisions are adopted with a simple majority (the majority of cast votes of present members), except if the Constitution or Rules of Procedure of the National Council require a different majority.
One of the exceptions in the decision-making of the National Council is the adoption of Rules of Procedure of the National Council, which must be adopted with an absolute majority (by 21 members of the National Council).
Decision-making and voting in the National Council is public. It is, however, confidential for matters specified by Rules of Procedure of the National Council or when the majority of present members of the National Council support confidential voting. Confidential voting may be proposed by the President of the National Council, at least eight members of the National Council, or one of the Interest Groups.