Logic Colloquium ‘99, the 1999 European Meeting of the Association for Symbolic Logic, took place in Utrecht, Netherlands, from Sunday August 1st (arrival day) until Friday August 6th, 1999. The colloquium sessions started on Monday August 2nd.

The main programme consisted of twelve invited lectures, four series of 3-lecture tutorials and three series of parallel sessions for contributed talks. There were also two evening lectures arranged by members of the Dutch logic community.

The Programme Committee consisted of Erik Barendsen, Jan van Eijck, SergeyGoncharov,WilfridHodges (Chair),Dick de Jongh, AlexanderKechris, Peter Koepke, Manuel Lerman, David Marker, Jaap van Oosten, Andrew Pitts and Albert Visser. The Organising Committee consisted of Jan van Eijck (chair), Peter Blok, Vincent van Oostrom, Simone Panka, Frans Snijders.

The Logic Colloquium was generously supported by the following organizations: Ercim, CWI, the City of Utrecht, NWO (Exact Sciences), OzsL, VvL, Spinoza Logic in Action, the departments ofmathematics and computer science of the Dutch universities, and ASL (with a contribution to the travel aid fund).

All papers in this volume are based on talks or tutorials given at the colloquium. The editors received reviewing help from Zoe Chatzidakis, Rosalie Iemhoff, Salma Kuhlmann, Quintijn Puite, Bas Terwijn, Simon Thomas, Anne Troelstra, and Yde Venema. Roman Kuznets helped us with the LATEX formatting.

Just before this volume went to press we received the sad news that Dr. Andreja Prijatelj died on April 1, 2002, in Ljubljana, after a six-month illness. She was 48 years old. Andreja was a fine colleague and we will miss her enthusiasm and warmth.