A juror who has been selected to replace any one of the regular jurors who may have become ill and cannot attend the full trial proceeding: These replacement or alternate jurors are responsible for the same tasks as regular jurors who will hear and decide cases.

Questions raised to jurors by the judge, prosecutor, and/or defense attorney relating to their qualifications as impartial finders of fact: Examples of challenges of jurors can be the removal of a perspective juror by his or her lack of qualification or because of bias.