Northern Territory Consolidated Regulations Northern Territory Consolidated Regulations9.02. Permissive joinder of parties
(1) Two or more persons may be joined as plaintiffs or defendants in a proceeding:
(a) where:
(i) if separate proceedings were brought by or against each of them, a common question of law or fact would arise in all the proceedings; and
(ii) all rights to relief claimed in the proceeding (whether they are joint, several or alternative) are in respect of or arise out of the same transaction or series of transactions; or
(b) subject to subrule (2), where the Court, before or after the joinder, gives leave to do so.
(2) The Court shall not give leave under subrule (1)(b) unless it is satisfied that the joinder:
(a) will not embarrass or delay the trial of the proceeding;
(b) will not prejudice a party; or
(c) is not otherwise inconvenient.