DocketXJoinder
Joinder is the legal process of combining multiple parties or claims into a single lawsuit to resolve them together.
What it actually is
Joinder allows a plaintiff to sue more than one defendant in the same case, or to bring multiple claims against a single defendant, when those parties or claims arise from the same transaction or occurrence. It appears in the initial pleadings when a party decides whom to name as defendants or what claims to include, and it can also be raised later by a motion to add or remove parties.
Why it matters in your case
Joinder affects who you are suing or being sued by, and what issues are decided in one trial, which can save time and money by avoiding multiple lawsuits. It also determines whether you must defend against claims brought by or against others in the same proceeding, potentially expanding the scope of discovery and trial.
The common misunderstanding
Many people mistakenly think joinder is optional in all cases, but courts often require joinder of necessary parties whose absence would prevent a complete resolution. Another common error is confusing joinder with class actions—joinder involves individual parties, not a representative group.
Get the actual rule
Definitions are orientation; rules are authority
This page explains the concept. When it matters to your case, read the rule that governs it in your court — we hold Texas, federal and Washington court rules word for word, and every state's official resources are on the state pages. If someone cites a case at you, check that it exists first.
Related
Terms that travel with this one
General explanation, not legal advice, and not specific to any state — procedures and deadlines vary by jurisdiction and court. If you can get a lawyer or free legal aid, do: every real option.