Iowa R. Civ. P. 1.232
As amended through Septmber 9, 2024
Any number of persons who claim any relief, jointly, severally or alternatively, arising out of or respecting the same transaction, occurrence or series of transactions or occurrences, may join as plaintiffs in a single action, when it presents or involves any question of law or fact common to all of them. They may join any causes of action, legal or equitable, independent or alternative, held by any one or more of them which arise out of such transaction, occurrence or series, and which present or involve any common question of law or fact.
Iowa. R. Civ. P. 1.232