A Practice Note addressing what happens on or after the return date of a proceeding under Article 78 of New York's Civil Practice Law and Rules (CPLR) in New York State Supreme Court (the state's trial court of general jurisdiction). Article 78 proceedings replace the common law writs of mandamus, certiorari, and prohibition in New York. Parties commonly use these proceedings to obtain judicial review of administrative determinations. The Note covers review of the court's jurisdiction, conversion to other forms of litigation, transfer to the appellate division, discovery, oral argument, trial, judgment, and appeal.