Abstract
The problem of adaptation of Protestantism to an urban civilization has occasioned a comprehensive study by the National Lutheran Council in the United States of the various facets of such an adaptation. The present article is a brief account of the general framework, aims and concepts of this study, as well as its effects on the efficacity of the Church in the city. Two distinct problems are in fact posed: that of the conditions of survival of institutions submitted to the impact of urban civilization; and that of clear definition of the signification to be given to the religious phenomenon and, consequently, to religious efficacity. This research poses problems both at the conceptual level and at that of pastoral strategy in the urban milieu.