DSC2005, a conference on systems and environments for statistical computing, will be held at the South Campus Center, University of Washington, Seattle. Following from the successful DSC 2003, 2001, and 1999 conferences at the Vienna University of Technology, DSC 2005 will focus primarily on open source software, in particular the R and Omegahat projects. The conference will begin with a reception on Friday August 12 and will have scientific presentations on August 13 and 14. Abstracts (one page) may be sent to this address (<dsc2005@u.washington.edu>). The deadline for submission is 15 April 2005, and notification of acceptance or rejection will be sent by 15 May 2005. Papers for publication in the online proceedings will be due in draft form by 1 August 2005 and in final form by 1 September 2005. Further information, including registration details, will be available in the future from http://depts.washington.edu/dsc2005/ -thomas Thomas Lumley Conference chair