Federal Rule of Civil Procedure 18
Rule 18. Joinder of Claims
(a) IN GENERAL. A party asserting a claim, counterclaim, crossclaim, or third-party claim may join, as independent or alternative claims, as many claims as it has against an opposing party.
(b) JOINDER OF CONTINGENT CLAIMS. A party may join two claims even though one of them is contingent on the disposition of the other; but the court may grant relief only in accordance with the parties’ relative substantive rights. In particular, a plaintiff may state a claim for money and a claim to set aside a conveyance that is fraudulent as to that plaintiff, without first obtaining a judgment for the money.
- Joinder is Civ Pro talk for joining together multiple claims and parties. The Federal Rules allow a party to join together multiple claims against multiple parties in a single complaint. If some claims are only applicable to certain parties the complaint will clarify who is alleged to be liable for which cause of action.