A trial follows a set sequence: jury selection, opening statements, the plaintiff or prosecution’s evidence, the defense’s evidence, closing arguments, jury instructions, deliberation, and a verdict. Understanding what happens during a trial means understanding that sequence and the roles the people in the courtroom play as it moves forward. The rules shift somewhat between civil and criminal cases, and between federal and state courts, but the framework is consistent enough that if you’ve followed one trial you can follow most.
Who Is in the Courtroom
The judge runs everything. The judge decides questions of law, rules on what evidence the jury can hear, keeps the proceedings moving, and ultimately issues a sentence or judgment. In a bench trial, with no jury, the judge also decides the facts.
Attorneys represent the parties. The prosecution or plaintiff sits on one side, the defense on the other, and each presents evidence and arguments aimed at whoever is deciding the outcome.
When there is a jury, the jurors are the finders of fact. They judge witness credibility, weigh the evidence, and deliver a verdict. In federal criminal trials, that verdict must be unanimous, a requirement the Supreme Court has recognized since the late 1800s and extended to state criminal trials as well.1Constitution Annotated. Amdt6.4.4.3 Unanimity of the Jury Civil cases sometimes allow non-unanimous verdicts depending on the jurisdiction, and many civil disputes skip the jury entirely.
Three other people keep the room functioning. The court clerk manages official records, swears in witnesses, and tracks exhibits. The bailiff maintains order, escorts jurors, and enforces the judge’s instructions on courtroom behavior. The court reporter produces a word-for-word transcript of everything said on the record, which becomes the official account if the case is appealed.
Jury Selection
A jury trial starts with voir dire, the process of picking impartial jurors from a larger panel. The judge and attorneys question prospective jurors about their backgrounds, experiences, and potential biases related to the case.2United States Courts. Juror Selection Process
Each side can remove jurors in two ways. A challenge “for cause” requires a demonstrated reason the person can’t be fair. A peremptory challenge, available in limited numbers, does not require a stated reason, but it cannot be used to exclude jurors based on race or gender. Once the panel is set and sworn, the trial itself begins.
Opening Statements
Each side delivers an opening statement to the jury. These are previews, not arguments. The attorney outlines the evidence the jury will hear and the story that evidence will tell. The plaintiff or prosecution goes first; the defense follows. Some defense attorneys choose to delay their opening until after the other side finishes presenting evidence, though this is uncommon.
Presenting Evidence
This is the longest part of the trial. The plaintiff in a civil case, or the prosecution in a criminal case, presents evidence first, in what is called the case-in-chief. After that side rests, the defense presents its own case-in-chief. The defense is never required to put on evidence at all because the burden of proof always stays with the side that brought the case, but in practice most defendants put on at least some evidence or testimony.
Direct Examination and Cross-Examination
Witnesses answer questions first from the side that called them. This is direct examination, and it typically requires open-ended questions; the attorney cannot lead the witness toward a particular answer. Then the opposing side cross-examines. Cross-examination flips the rule: leading questions are expected, and they are the primary tool for testing credibility.
Testimony is evidence given under oath. Every witness swears to tell the truth before testifying, and lying under oath is perjury, a federal crime punishable by up to five years in prison.3Office of the Law Revision Counsel. 18 USC Ch. 79 Perjury That penalty applies whether the false statement happens in the courtroom, a deposition, or a sworn written declaration.
Exhibits
Physical evidence like documents, photographs, or objects must be formally admitted before the jury can consider it. The attorney introducing an exhibit needs to lay a foundation, showing it is authentic, relevant, and not barred by any evidentiary rule. The judge decides whether to admit each exhibit, and the opposing side can object.
Expert Witnesses
Most witnesses testify about what they personally saw or experienced. Expert witnesses are different. They are brought in because of specialized knowledge that helps the jury understand technical or scientific evidence. Under Federal Rule of Evidence 702, a person qualifies as an expert through knowledge, skill, experience, training, or education, and the party calling the expert must show the testimony rests on sufficient facts, uses reliable methods, and applies those methods properly.4Legal Information Institute. Rule 702 Testimony by Expert Witnesses Judges act as gatekeepers and can exclude expert testimony if the methodology is flawed or the conclusions unsupported.
Objections
Objections run throughout the evidence phase. An objection is a formal challenge by an attorney to a question, answer, or piece of evidence. If a witness starts repeating what someone else told them, for example, the opposing attorney may object on hearsay grounds, since hearsay is generally inadmissible under Federal Rule of Evidence 802.5Legal Information Institute. Federal Rules of Evidence Rule 802 – The Rule Against Hearsay
If the judge agrees, the objection is “sustained” and the evidence is excluded or the question must be rephrased. If the judge disagrees, it is “overruled” and the evidence stands. Attorneys must object in real time or they waive the issue; you cannot complain about evidence on appeal if you did not challenge it when it came in.
Sidebars
When attorneys need to discuss a sensitive procedural or evidentiary issue without the jury hearing, they request a sidebar, a brief, quiet conference at the judge’s bench. These conversations stay on the record; the court reporter captures them. Sidebars often arise when one side wants to object to a line of questioning but explaining the reason for the objection would itself prejudice the jury.
Closing Arguments
After both sides rest, each attorney delivers a closing argument, pulling the testimony and exhibits together into a narrative that supports their position. Closings are persuasive in a way openings are not. This is where attorneys argue what the evidence means and why their side should win.
Jury Instructions and Deliberation
The judge then instructs the jury on the relevant law, including the burden of proof and the specific legal elements the jury must evaluate.2United States Courts. Juror Selection Process These instructions carry heavy weight. The jury decides the facts, but the judge tells the jurors what legal framework to apply to those facts. After instruction, the jury deliberates privately and returns a verdict, which is read aloud in open court.
The Burden of Proof
The burden of proof is the standard the side bringing the case must meet to win, and it differs dramatically between criminal and civil proceedings.
In criminal cases, the prosecution must prove guilt “beyond a reasonable doubt,” the highest standard in the legal system. It does not mean absolute certainty, but it means the evidence must be strong enough that a reasonable person would have no real hesitation about the conclusion. This high bar exists because a criminal conviction can take away someone’s freedom.
In civil cases, the standard drops to a “preponderance of the evidence,” which simply means more likely than not. If you picture a scale tipping even slightly in one direction, the side with more weight wins. Some civil claims, like fraud, require “clear and convincing evidence,” which falls between the two main standards but is less common.
Verdict, Sentencing, and Appeal
Once the jury returns a verdict, a civil case is effectively over at the trial level, subject to post-trial motions and any appeal. A criminal case continues to sentencing if the defendant is found guilty.
In federal court, judges must consult the Federal Sentencing Guidelines as a starting point, but after the Supreme Court’s 2005 decision in United States v. Booker, those guidelines are advisory rather than mandatory. Judges can impose sentences outside the guideline range as long as they explain their reasoning, weighing factors like the seriousness of the offense, the defendant’s history, and the need for deterrence.
Sentencing hearings look different from trial. Both sides can present evidence that would not have been admissible during trial, including victim impact statements, character witnesses, and details about the defendant’s background. The rules of evidence are relaxed, and the judge, not the jury, controls the outcome. Some offenses carry mandatory minimum sentences set by Congress, which limit the judge’s discretion regardless of the circumstances.
The losing party can appeal, but an appeal is not a second trial. Appellate courts do not hear new testimony or weigh evidence; they review the trial record for legal errors such as the judge misapplying the law, improperly admitting or excluding evidence, giving incorrect jury instructions, or violating constitutional rights. Timing is strict. In federal civil cases, you generally have 30 days from the entry of judgment to file a notice of appeal. In federal criminal cases, a defendant has just 14 days.6Legal Information Institute. Rule 4 Appeal as of Right – When Taken Miss the deadline and the appeal is almost always dismissed, regardless of how strong the argument might be.
Not every error justifies reversal. Appellate courts distinguish between “harmless error,” a mistake that did not affect the outcome, and “reversible error,” one that did. If the appellate court finds reversible error, it may overturn the verdict, modify the judgment, or send the case back to the trial court for a new proceeding.
If You Are Sitting in Court
Courts enforce strict rules of behavior, and these apply to spectators as well as parties. Dress appropriately: no hats, shorts, or athletic wear in most courtrooms. Silence your phone. Do not record anything without the judge’s permission. Stand when the judge enters or exits, and when you are speaking to the court. Address the judge as “Your Honor.”
Disruptive behavior, including outbursts, talking during testimony, or unauthorized movement in the courtroom, can lead to contempt of court. Under federal law, courts can punish misbehavior in or near the courtroom that obstructs the administration of justice, using fines, imprisonment, or both.7Office of the Law Revision Counsel. 18 USC 401 Power of Court Contempt is one of the few situations where a judge can order someone jailed on the spot without a separate trial. Attending court is a right. Disrupting it is not.