The Old Order Movement was a religious movement to preserve the old ways, that emerged in the second half of the 19th century among the Amish, Mennonites of South German and Swiss ancestry and among the Schwarzenau Brethren in the United States and Canada. The movement led to several Old Order divisions from mainstream Anabaptist groups between 1845 and 1901. All Old Order groups that emerged after 1901 divided from established Old Order groups or were formed by people coming from different Old Order groups. The highly conservative Old Colony Mennonites and the Hutterites were not directly connected to this movement. Sandra L. Cronk writes about the Old Order Movement:
The Old Order Amish and the Old Order Mennonites [...] are not premodern relics from a bygone era. The Old Order movement is a conscious attempt to maintain a style of Christian living based on principles different from those of the larger society.
Old Order groups do not have seminary trained pastors and never developed written sophisticated theology. Many practices among the Old Orders stem from the biblical principle of nonconformity to the world, according to Romans 12:2 and other Bible verses.
The avoidance of technologies by Old Order communities is based not on a belief that the technology is in some way evil, but over a concern for the nature of their communities. Community is important to members of Old Order groups, and a technology or practice is rejected if it would adversely affect it. This means that the prohibitions are not usually absolute; a member who would not own a car may use a car or other modern transport if a pressing need arises. This basis also means that Old Orders see no contradiction in having electricity in their milking barn, since that is necessary to comply with regulations on milk cooling, but not in their house.
Other aspects of Old Order life are concerned with plainness, which dictates their distinctive dress. Plain to Old Orders is the opposite of showy or ostentatious, and is considered a virtue. It is based on the belief that a person's true worth does not lie in their clothes or appearance.