The General Instruction of the Roman Missal (GIRM)—in the Latin original, Institutio Generalis Missalis Romani (IGMR)—is the detailed document governing the celebration of Mass of the ordinary form of the Roman Rite of the Catholic Church since 1969. It is printed at the start of recent editions of the Roman Missal. This document unified and replaced a number of documents that were printed in earlier editions: