Swiss Civil Procedure Code
(Civil Procedure Code, CPC)

¹ If two or more per­sons are in a leg­al re­la­tion­ship that calls for one single de­cision with ef­fect for all of them, they must jointly ap­pear as plaintiffs or be sued as joint de­fend­ants.

² Pro­ced­ur­al acts duly car­ried out by one of the joint parties are like­wise ef­fect­ive for the oth­ers, with the ex­cep­tion of chal­len­ging a de­cision.