The discussion revived by analytical philosophy concerning the continuity of the person is dealt with here and applied to the question of the current possibility of promise and trust in an interdisciplinary discussion. Philosophical, psychological, legal, medical, economic, sociological, scientific, political and theological aspects of the problem are discussed and compared. With contributions by Friedrich Cramer, Hinderk M. Emrich, Jean Greisch, Fritz Hartmann, Norbert Horn, Klaus-M. Kodalle, Peter Koslowski, Richard Schenk, Robert Spaemann and Ulrich Steinvorth.