Models of the Church by Avery Cardinal DullesThere is today a dramatic reexamination of structure, authority, dogma indeed, every aspect of the life of the Church is held up to scrutiny. Welcoming this as a sign of vitality, Avery Dulles has carefully studied the writings of contemporary Protestant and Catholic ecclesiologists and sifted out six major approaches, or models, through which the Churchs character can be understood: as Institution, Mystical Communion, Sacrament, Herald, Servant, and,