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Issue Preclusion
Issue preclusion means that once a court has decided a specific fact or legal question, you cannot ask a different court to decide that same question again in another case.
What it actually is
It is a procedural doctrine that applies after a final judgment in a prior lawsuit. If the same issue was actually litigated and necessary to the prior ruling, it becomes binding in later cases between the same parties (or those closely related). It appears when one side tries to raise an argument that was already resolved.
Why it matters in your case
It saves time and prevents inconsistent outcomes by making prior decisions final. For someone in a case, it means you must raise and fully contest every issue you care about the first time, because you may not get a second chance.
The common misunderstanding
People often confuse issue preclusion with claim preclusion, but they are different. Issue preclusion only bars re-deciding a single issue, not the entire claim or lawsuit.
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.