Rule 2 Who may be joined as defendants
Northern Ireland
All persons may be joined as defendants in one action against whom the right to any relief in respect of or arising out of the same transaction or event or series of transactions or events is alleged to exist, whether jointly, severally or in the alternative, where if separate actions were brought any common question of law or fact would arise.
A decree may be given against such one or more of the defendants as may be found to be liable according to their respective liabilities without any amendment.
Where two or more persons are made defendants, whether as jointly or as severally liable, the plaintiff may have a decree against any one or more of the defendants without prejudice to his right to proceed with the action against any other defendant.
Where a plaintiff proceeds against one or more of several persons jointly liable, the defendant or defendants sued may avail himself or themselves of any set-off or other defence to which he or they would be entitled if all the persons liable were made defendants.