Class action admissibility considers impracticable joinder, common issues, typical representative claims, and risk of inconsistent outcomes. When assessing admissibility under section 245(4), the Tribunal must consider whether a class action is appropriate by examining impracticability of individual joinder, common questions of law or fact, typicality of representative claims or defences, and adequacy of representation; and whether separate actions would risk inconsistent adjudications, dispositive outcomes for other members, or substantial impairment of other members' ability to protect their interests.