The Book of Common Order is the name of several directories for public worship, the first originated by John Knox for use on the continent of Europe and in use by the Church of Scotland since the 16th century. The Church published revised editions in 1940, 1979, and 1994, the latest of these called simply Common Order. Gaelic versions have long been available, and in 1996 the Church of Scotland produced "Leabhar Sheirbheisean", a Gaelic supplement to the Book of Common Order.