Although there are variations around the country in the names used, there are two basic categories of juries: Grand Juries and Petit Juries. Grand Juries are convened within the criminal justice system at the State or Federal level to decide whether there is sufficient evidence to charge one or more persons or entities with a crime. Petit Juries are the juries who actually decide cases and render verdicts, either in civil or criminal cases. Although it is possible for you to be summoned for service on either type of jury, most people are summoned for service on a Petit Jury. The information on this page is primarily intended to provide information about service on Petit Juries.