The controversial topics with the Churches stemming from the Reformation are examined in the perspective of the dialogues developed by the Roman Catholic Church after the promulgation of the Decree on Ecumenism. Among these questions are the relation between Scripture and Tradition, the doctrines of Justification, the Eucharist as memorial and real presence and mixed marriages. The point of convergence, which surpasses the impasse of confessional oppositions, born from the conversations with the Anglican Communion, Lutherans, the World Alliance of Reformed Churches and Methodists, is, with all the problems still remaining, an attempt to re-establish fellowship in view of restoring full communion. This aspect is examined especially in the perspective of the theological project concerning «conciliar fellowship», which is here viewed as the scope of the bilateral dialogues, and under the sponsorship of Faith and Order, the multilateral dialogues on «the Unity we Seek» (Nairobi 1975 Assembly of the WCC) and «Baptism, Eucharist and Ministry» (Lima Document, Vancouver 1983 Assembly). In this realm, attention is focused specifically on the question of the local church, which all the churches stemming from the Reformation present as the ecclesiological starting point for reaching the universal communion of the Church («conciliar fellowship»). The ecclesiological perspectives of Vatican II on the local church, which have opened the way to a new interpretation of the divisions between Christians, is the frame in which «conciliar fellowship» is being considered. This broader ecclesiology is linked with the question of the recognition of ordained ministries. The Lima Document, which is crossroad of the bilateral dialogues on this topic, proposes as a solution solid bases for further evolution, depending on the «reception» which the Churches will open themselves to the Spirit, to prayer and reflection, means offered to them by the dialogues. A list of the dialogues examined is appended (pp. 539-586).