A paper presented at the conference organized by ?Centro aletti? and Departement of Pastoral and Spiritual Theology of the University of Olomouc introduces one of the possible ecumenical models of ?communio ecclesiarum?, based on fundamental agreement concerning the common understanding of the Gospel, as it was expressed in the ?Leuenberg agreement? of 1973. This model makes possible a fellowship of (Protestant) churches of different confessional positions and church orders without centralized ?magisterium?.