Symbolic model checking is a formal technique for the verification of finite-state concurrent systems. Symbolic model checkers (e.g. SMV, VIS) have been used to verify industrial systems, ranging from hardware to communication protocols to safety critical plants and procedures. Symbolic model checking is the core technique for several industrial verification tools, and is applied in technology transfer projects. The aim of the SMC'99 workshop is to bring together active developers and users of symbolic model checkers, compare state of the art model checking techniques (e.g. compositional reasoning, abstraction, partitioning), discuss experimental results and experience reports, and promising directions for future research.

Nine contributions (out of twenty-two submissions) were selected for presentation by the program committee. The workshop program is completed by two keynote invited lectures, given by Ken McMillan (Cadence Labs, USA) on Compositional Reasoning and Abstraction, and Fabio Somenzi (University of Colorado, USA) on Symbolic State Exploration

Thanks are due to a number of people who helped to organize and plan the workshop. Among this group are the Program Committee members:

The following people helped in the evaluation of the submissions: Yael Abarbanel-Vinov, Neta Aizenbud-Reshef, Shoham Ben-David, Doron Bustan, Jorge Cuellar, David Deharbe, Cindy Eisner, Ranan Fraer, Edelweis Garcez, Leonid Gluhovsky, Marcelo Glusman, Jae-Young Jang, Shmuel Katz, Sharon Keidar, Monika Maidl, Robi Malik, Anamaria Martins Moreira, Shiri Moran, Peter Päppinghaus, Marco Roveri, Peter Warkentin, Karen Yorav, Jun Yuan, Yunshan Zhu.

We would like to thank IBM Haifa Research Laboratory for the financial support to SMC'99. Carola Dori, Morena Carli, Marco Roveri and Adolfo Villafiorita helped in several matters related to the local organization. Finally, we are grateful to Michael Mislove for his constat support during the preparation of this electronic volume.

Alessandro Cimatti and Orna Grumberg, Guest Editors