In response to a large number of requests, the submission deadline for TACS has been extended to April 15th. Authors intending to submit during this grace period are requested to email the title and abstract of their paper before the original deadline (April 1st) to bcpierce@cis.upenn.edu. Call For Papers Fourth International Symposium on Theoretical Aspects of Computer Science (TACS 2001) October 29-31, 2001 Tohoku University, Sendai, Japan http://tacs2001.ito.ecei.tohoku.ac.jp/tacs2001/ The TACS Symposium will focus on the theoretical foundations of programming and their applications. The topics of interest include... Theoretical aspects of the design, semantics, analysis, and implementation of programming languages and systems; logics of programs; calculi and models of concurrency and parallel computation; theories of mobile computation and system security; categories and types in computer science; formalisms, methods, and systems for program specification, verification, synthesis, and optimization; constructive, linear, and modal logics in computer science. The scientific program will consist of invited lectures, contributed talks, and demo sessions. A proceedings containing the full papers of the invited and contributed talks will be published by Springer-Verlag as a volume of Lecture Notes in Computer Science. IMPORTANT DATES Submission deadline: April 15, 2001 Notification to authors: June 20, 2001 Deadline for final versions: July 23, 2001 INVITED SPEAKERS Luca Cardelli Microsoft Research Daniel Jackson Massachusetts Institute of Technology Christine Paulin-Mohring Universite Paris Sud & INRIA Andrew Pitts University of Cambridge Jon Riecke Lucent Technologies Kazunori Ueda Waseda University CONFERENCE CHAIR: Takayasu Ito Tohoku University PROGRAM CO-CHAIRS: Naoki Kobayashi Tokyo Institute of Technology kobayasi@cs.titech.ac.jp Benjamin Pierce University of Pennsylvania bcpierce@cis.upenn.edu PROGRAM COMMITTEE: Zena Ariola University of Oregon Cedric Fournet Microsoft Research Jacques Garrigue Kyoto University Masami Hagiya University of Tokyo Robert Harper Carnegie Mellon University Masahito Hasegawa Kyoto University Nevin Heintze Lucent Technologies Martin Hofmann Edinburgh University Zhenjiang Hu University of Tokyo Naoki Kobayashi Tokyo Institute of Technology Martin Odersky Ecole Polytechnique Federale de Lausanne Catuscia Palamidessi Pennsylvania State University Benjamin Pierce University of Pennsylvania Francois Pottier INRIA Andre Scedrov University of Pennsylvania Natarajan Shankar SRI International Ian Stark Edinburgh University Makoto Tatsuta Kyoto University SUBMISSION INFORMATION Authors are invited to submit full papers (up to 6000 words, including figures and bibliographies). Papers must be unpublished and not submitted for publication elsewhere. Submissions should be in Postscript or PDF format, on A4 or US letter pages. They must be printable on common printers and viewable with ghostview or acroread. The first page of each submission should include the email address, telephone, and fax numbers of the corresponding author. Accepted papers must be presented at the symposium, and the final manuscript must be prepared in the LNCS format. All submissions should be made electronically through the TACS submission page http://saul.cis.upenn.edu:8086/.