A more thorough explanation:

Summary adjudication of issues is a court order that decides certain factual issues before a trial. This order is based on a motion by one of the parties, who argues that these issues are already settled and do not need to be tried. The motion is supported by evidence such as declarations under oath, excerpts from depositions, and admissions of fact by the opposing party. The other party can respond with their own evidence and legal arguments.

The purpose of summary adjudication is to reduce the number of factual questions that need to be addressed at trial and to eliminate one or more causes of action in the complaint. It can also result in a judgment for the plaintiff. This process is often used in conjunction with a motion for summary judgment, which can result in a judgment on the entire complaint or some causes of action before the trial starts.

Imagine a case where a plaintiff is suing a defendant for breach of contract and fraud. The defendant files a motion for summary adjudication of issues, arguing that certain factual issues are already settled and do not need to be tried. The defendant provides evidence such as declarations from witnesses and excerpts from depositions to support their motion. The plaintiff responds with their own evidence and legal arguments, but the court ultimately grants the defendant's motion for summary adjudication on some of the issues. This means that those issues will not be addressed at trial, and the plaintiff's case may be weakened as a result.