Wikipedia
Ordnung
The Ordnung is a set of rules for Amish, Old Order Mennonite and Conservative Mennonite living. Ordnung is the German word for order, discipline, rule, arrangement, organization, or system. Because the Amish have no central church government, each assembly is autonomous and is its own governing authority. Thus, every local church maintains an individual set of rules, adhering to its own Ordnung, which may vary from district to district as each community administers its own guidelines. These rules are largely unwritten, yet they define the very essence of Amish identity. Conservative Mennonites refer to Ordnung by the English terms "discipline" or "standard" and are usually written.