Within some criminal justice systems, a preliminary hearing ( evidentiary hearing) is a proceeding, after a criminal complaint has been filed by the prosecutor, to determine whether, and to what extent, criminal charges and civil cause of actions will be heard (by a court), what evidence will be admitted, and what else must be done (before a case can proceed). At such a hearing, the defendant may be assisted by counsel, indeed in many jurisdictions there is a right to counsel at the preliminary hearing.