<P> In common law, a petit jury (or trial jury, sometimes petty jury) hears the evidence in a trial as presented by both the plaintiff (petitioner) and the defendant (respondent). After hearing the evidence and often jury instructions from the judge, the group retires for deliberation, to consider a verdict . The majority required for a verdict varies . In some cases it must be unanimous, while in other jurisdictions it may be a majority or supermajority . A jury that is unable to come to a verdict is referred to as a hung jury . The size of the jury varies; in criminal cases involving serious felonies there are usually 12 jurors, although Scotland uses 15 . A number of countries that are not in the English common law tradition have quasi-juries on which lay judges or jurors and professional judges deliberate together regarding criminal cases . However, the common law trial jury is the most common type of jury system . </P> <P> In civil cases many trials require fewer than twelve jurors . Juries are almost never used in civil cases outside the United States and Canada . Other states with a common law tradition sometimes use them in defamation cases, in cases involving a governmental eminent domain power, and in cases involving alleged wrongful conviction . Civil law countries generally do not use civil juries . Civil juries are available in the United States and Canada in almost all cases where the only remedy sought is money damages . </P>

What kind of cases do petit jurors hear