This book presents the proceedings of the 15th International Liturgical Colloquium organised by the Liturgical Institute of the Faculty of Theology in Leuven from the 22nd through the 23rd of October 2001. The topic of this meeting was: 'ars celebrandi' or the art to celebrate the liturgy. After an English introduction to the topic by Prof. J. Lamberts (Leuven) the reader will find the following papers: Prof. A. Heinz (Trier), 'Ars celebrandi' - Uberlegungen zur Kunst, die Liturgie der Kirche zu feiern; DR. Gino Mattheeuws (Leuven), The 'ars celebrandi' of the liturgical congregation: some forgotten dimensions; Prof. L.-M. Chauvet (Paris), La presidence liturgique dans la modernite: les chances possibles d'une crise; Prof. L. van Tongeren (Tilburg), Vers une utilisation dynamique et flexible de l'espace. Une reflexion renouvelee sur le reamenagement d'eglises; Prof. A. Vernooij (Tilburg), La musique comme liturgie; Dr. W.-M. Speelman (Utrecht), Liturgy and theatre: towards a differentiation; drs. J. Polfliet, A la recherche d'une spiritualite de la celebration liturgique.