Summary adjudication and summary judgment both ask a judge to decide something without a trial, but they aim at very different targets. Summary judgment seeks to end the entire lawsuit before trial. Summary adjudication — known in federal court as partial summary judgment — resolves only specific claims, defenses, or issues within a case and sends what’s left to the jury. Same legal test, very different consequences.
What Summary Judgment Does
Summary judgment is a request to end a lawsuit outright. The moving party argues that the key facts aren’t really in dispute and the law clearly favors their side, so there’s nothing for a jury to resolve. Under Federal Rule of Civil Procedure 56, a court “shall grant summary judgment if the movant shows that there is no genuine dispute as to any material fact and the movant is entitled to judgment as a matter of law.”1Legal Information Institute. Federal Rules of Civil Procedure Rule 56
When a judge grants it, the case is over. The court enters a final judgment for the winning side, and the losing party’s only option is to appeal. That finality is the whole point. Trials exist to resolve factual disagreements, and when none remain, the judge applies the law and declares a winner.
What Summary Adjudication Does
Summary adjudication targets individual pieces of a lawsuit rather than the whole thing. A party can ask the court to resolve a single claim, strike an affirmative defense, or eliminate a specific category of damages such as punitive damages. Rule 56 allows a motion on “each claim or defense — or the part of each claim or defense” at issue.1Legal Information Institute. Federal Rules of Civil Procedure Rule 56
If the court grants the motion, those resolved issues are treated as established going forward, but the rest of the case continues toward trial. The advisory committee notes describe this as “merely a pretrial adjudication that certain issues shall be deemed established for the trial of the case,” meant to speed up litigation by clearing away matters with no genuine factual dispute.1Legal Information Institute. Federal Rules of Civil Procedure Rule 56
A terminology note matters here. In federal courts, the formal name is “partial summary judgment.” The phrase “summary adjudication” is used primarily in California and a handful of other states that have separate procedural rules for it. The underlying concept is the same. The procedural details vary depending on whether you’re in federal or state court.
Scope and Outcome: Where the Two Really Diverge
The core difference is simple. Summary judgment is all-or-nothing. Summary adjudication is surgical. One asks the judge to decide the entire lawsuit; the other asks the judge to rule on specific issues while leaving everything else alive. That split has consequences beyond just what gets resolved.
Finality. A full summary judgment produces a final, appealable order. A partial summary judgment doesn’t. It’s an interlocutory order, meaning the losing party generally cannot appeal it until the entire case concludes.
Trial impact. After summary adjudication, the remaining claims still go to trial, but the scope narrows. Parties no longer need to present evidence or argue about the resolved issues, which shortens the trial and cuts costs.
Settlement leverage. Losing a claim on summary adjudication often changes the settlement math. If a punitive damages claim gets eliminated before trial, the remaining case may be worth far less, pushing both sides toward negotiation.
The Legal Standard Is the Same
Whether you’re seeking full summary judgment or partial summary adjudication, the legal test is identical. The moving party has to show two things: that no genuine dispute exists about any fact that matters to the outcome, and that the law entitles them to win on those undisputed facts.1Legal Information Institute. Federal Rules of Civil Procedure Rule 56
A “material fact” is one that could change the result. If two witnesses disagree about the color of a car at a crash scene but that detail has no bearing on who caused the accident, the disagreement isn’t material. A “genuine dispute” means there’s enough evidence that a reasonable jury could side with either party on that fact. The judge doesn’t weigh evidence or decide who’s more credible. Those are jury tasks. The judge only decides whether a real factual disagreement exists at all.
Evidence has to be concrete. You can’t defeat either motion with vague assertions or the allegations in your complaint. Rule 56 allows parties to rely on depositions, documents, electronically stored information, affidavits or declarations, stipulations, admissions, and interrogatory answers.1Legal Information Institute. Federal Rules of Civil Procedure Rule 56 Affidavits and declarations must be based on personal knowledge, contain facts that would be admissible at trial, and demonstrate that the person making the statement is competent to testify about those facts.
Appealability: The Biggest Practical Split
Appealability is one of the most important practical differences between the two motions. When a court grants full summary judgment, it produces a final decision that can be immediately appealed to a higher court. Federal appellate courts have jurisdiction over “appeals from all final decisions of the district courts.”2Office of the Law Revision Counsel. 28 USC 1291 – Final Decisions of District Courts
A partial summary judgment is different. It resolves some issues but leaves the case ongoing, which means you generally cannot appeal it right away. You typically must wait until the entire case is resolved — after trial or after the remaining claims are disposed of — before challenging the partial ruling on appeal. The advisory notes to Rule 56 state this explicitly: “a partial summary ‘judgment’ is not a final judgment, and, therefore, that it is not appealable.”1Legal Information Institute. Federal Rules of Civil Procedure Rule 56
There’s a narrow exception. Under 28 U.S.C. § 1292(b), a district judge can certify an interlocutory order for immediate appeal if it involves a controlling question of law where there’s substantial ground for disagreement, and an immediate appeal would materially advance the end of the litigation.3Office of the Law Revision Counsel. 28 USC 1292 – Interlocutory Decisions Even then, the appellate court has discretion to accept or decline. In practice, this path is rarely used.
When an appellate court does review a summary judgment ruling, it applies a de novo standard. It looks at the evidence fresh, without giving any deference to the trial judge’s conclusions, and views the facts in the light most favorable to the party that lost the motion.
When to Choose Which Motion
Filing for full summary judgment makes sense when you believe you can end the case outright. Defendants file these motions when the plaintiff’s evidence on a key element is thin or nonexistent. Plaintiffs file them when liability is essentially conceded through the defendant’s own documents or admissions. The payoff is obvious. If you win, the case is over and you avoid the expense and unpredictability of trial.
Summary adjudication is a different kind of tool, more scalpel than sledgehammer. Experienced litigators use it to reshape the case before trial. Common targets include:
- Punitive damages claims. Eliminating the threat of punitive damages can dramatically reduce a defendant’s exposure and ease settlement pressure.
- Weak individual claims. In cases with multiple claims, knocking out the weaker ones forces the opposing party to go to trial on their least favorable theories.
- Affirmative defenses. A plaintiff can use summary adjudication to eliminate a defendant’s key defenses, making the remaining issues easier to win in front of a jury.
Both motions are expensive to prepare. A straightforward motion in a simple case might take 10 to 20 hours of attorney time, while complex commercial cases with extensive discovery records can require 50 hours or more. A motion that gets denied accomplishes nothing except running up the bill and previewing your trial strategy for the other side.
How to Oppose Either Motion
If someone files one of these motions against you, the response needs to do one thing above all else: show the judge that a genuine factual dispute exists. You do that by pointing to specific evidence in the record — deposition testimony, documents, declarations — that contradicts the moving party’s version of events. General denials or restatements of your complaint allegations won’t work.
Rule 56 requires that you cite “particular parts of materials in the record” to support each factual assertion you’re disputing.1Legal Information Institute. Federal Rules of Civil Procedure Rule 56 This is where many oppositions fail. Lawyers sometimes respond with lengthy legal arguments while neglecting to attach the actual evidence. The judge needs to see the conflicting evidence, not just be told it exists.
If you haven’t yet had enough opportunity to conduct discovery and therefore lack the evidence you need, Rule 56(d) provides an escape valve. You can file an affidavit or declaration explaining the specific reasons why you cannot yet present the facts needed to oppose the motion. The court can then defer ruling, deny the motion, or give you additional time to take discovery.1Legal Information Institute. Federal Rules of Civil Procedure Rule 56 This isn’t a blank check. You need to explain exactly what discovery you still need and why it matters. Courts deny vague requests routinely.
Ignoring the motion is the worst possible move. Under Rule 56(e), when a party fails to properly address another party’s assertion of fact, the court can give you another chance to respond, consider the fact undisputed, grant summary judgment if the undisputed facts support it, or issue any other appropriate order.1Legal Information Institute. Federal Rules of Civil Procedure Rule 56 Some judges will grant an unopposed motion almost automatically. Others will still review the evidence independently. Either way, silence is a gamble.