Dear Colleagues, Here is the formal announcement of the International Linear Collider Workshop in Barcelona. Please note the new Web URL. Best wishes, Michael Peskin %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% INTERNATIONAL WORKSHOP ON LINEAR COLLIDERS (LCWS99) April 28 -- May 5, 1999 Conference information: http://www.cern.ch/Physics/LCWS99/ The fourth in the series of International Workshops on Linear Colliders (LCWS99) will take place in Sitges, Barcelona, Spain, on April 28-May 5, 1999. This workshop continues the series of conferences devoted to physics and experimentation at linear colliders which have been held previously in Finland, Hawaii, and Japan. At the same time, the workshop will be the first general meeting of the recently organized `World-Wide Study of Physics and Detectors for Future Linear Colliders'. The previous workshops in this series have emphasized the physics goals of a future linear collider and the general machine design options. There is now widespread interest at major laboratories in Asia, Europe, and North America in building such an accelerator; groups at KEK, DESY, and SLAC/LBL/LLNL have begun work on designs for machines that are expected to be formally proposed in the next few years. There is thus the need to begin designing the linear collider detectors and developing technologies that will play a key role in the experiments. Both of these themes, physics studies and detector development, will be discussed at LCWS99. The program will consist of one day of introductory talks and status reports on the accelerator projects, three days of parallel sessions devoted to physics and detector issues, and two days of plenary talks giving highlights of the parallel sessions and new developments. The complete program is posted at the Web site listed above. We invite your participation in the workshop. In particular, the parallel for LCWS99 are now being organized. If you would like to present a talk, please contact one of the session organizers for that session as soon as possible. Enrique Fernandez, IFAE, U. Auton. Barcelona Michael Peskin, SLAC for the organizing committee