Jury selection refers to several methos used to choose the people who will serve on a trial jury. The jury pool is first selected from among the community using a reasonably random method. The prospective jurors are then questioned in court by the judge and/or attorneys. Depending on the jurisdiction, attorneys may have an opportunity to mount a challenge for cause argument or use one of a limited number of peremptory challenges. In some jurisdictions that have capital punishment, the jury must be death-qualified to remove those who are opposed to the death penalty. Attorneys sometimes use expert assistance in systematically choosing the jury, although other uses of jury research are becoming more common.