M. Rowan-Robinson (Imperial College London, UK) Chairman; A. Franceschini (Osservatorio Astronomico, Padova, I); R. Genzel (Max-Planck-Institut für extraterrestrische Physik, Garching, D); M. Grewing (Institut de Radio-Astronomie Millimétrique, Grenoble, F); R. Hills (Cavendish Labatory, Cambridge, UK); J. Mather (Goddard Space Flight Centre, Greenbelt, USA); G. Miley (Sterrewacht, Leiden, NL); L. Nordh (Swedish National Space Board, Solna, S); H. Okuda (Institute of Space and Astronautical Science, Sagamihara, J); T. Phillips ((Caltech, Pasadena, US); G. Pilbratt (ESA Astrophysics Division/Space Science Department, ESTEC, Noordwijk, NL); J.-L. Puget (Institut d'Astrophysique Spatiale, Orsay, F); G. Sholomitski (Space Research Institute, Moscow, R); P. Solomon (State University of New York, Stony Brook, USA); E. van Dishoeck (Sterrewacht, Leiden, NL); S. Volonte (ESA Directorate of Scientific Programmes, ESA-HQ, Paris, F); C. Waelkens (Instituut voor Sterrenkunde, Leuven, B);