Apostolic succession is the method whereby the ministry of the Christian Church is held to be derived from the apostles by a continuous succession, which has usually been associated with a claim that the succession is through a series of bishops. Christians of the Roman Catholic, Eastern Orthodox, Oriental Orthodox, Old Catholic, Moravian, Hussite, Anglican, Church of the East, and Scandinavian Lutheran traditions maintain that "a bishop cannot have regular or valid orders unless he has been consecrated in this apostolic succession." Each of these groups does not necessarily consider consecration of the other groups as valid.