A civil petit jury is typically made up of 6 to 12 persons. In a civil case, the role of the jury is to listen to the evidence presented at a trial, to decide whether the defendant injured the plaintiff or otherwise failed to fulfill a legal duty to the plaintiff, and to determine what the compensation or penalty should be.
A criminal petit jury is usually made up of 12 members. Criminal juries decide whether the defendant committed the crime as charged. The sentence usually is set by a judge.
Verdicts in both civil and criminal cases must be unanimous, although the parties in a civil case may agree to a non-unanimous verdict. A jury's deliberations are conducted in private, out of sight and hearing of the judge, litigants, witnesses, and others in the courtroom.
We The People - The Honor of Jury Service