This volume contains the proceedings of the 21st International Conference on Computer-Aided Veri?cation (CAV) held in Grenoble, France, between June 28 and July 2, 2009. CAV is dedicated to the advancement of the theory and practice of computer-aided formal analysis methods for hardware and software systems. Its scope ranges from theoretical results to concrete applications, with an emphasis on practical veri?cation tools and the underlying algorithms and techniques. Everyinstanceofaconferenceisspecialinitsownway.ThisCAVisspecialfor at least two reasons: ?rst, it took place in Grenoble, the place where the CAV series started 20 years ago. Secondly, there was a particularly large number of paper submissions: 135 regular papers and 34 tool papers, summing up to 169 submissions. They all went through an active review process, with each submissionreviewedbyfourmembersoftheProgramCommittee.Wealsosought external reviews from experts in certain areas. Authors had the opportunity to respond to the initial reviews during an author response period. All these inputs wereusedbytheProgramCommitteeinselectinga?nalprogramwith36 regular papers and 16 tool papers. In addition to the presentation of these papers, the program included the following: - Four invited tutorials: Rachid Guerraoui (EPFL Lausanne, Switzerland): Transactional M- ory: Glimmer of a Theory. Jaeha Kim (Stanford, USA): Mixed-Signal System Veri?cation: A High- Speed Link Example. Jean Krivine (Institut des Hautes Etudes Scienti?ques, France): M- elling Epigenetic Information Maintenance: A Kappa Tutorial. JosephSifakis (CNRS-VERIMAG, France): Component-BasedConstr- tion of Real-Time Systems in BIP."

This book constitues the refereed proceedings of the 6th International Workshop on Hybrid Systems: Computation and Control, HSCC 2003, held in Prague, Czech Republic, in April 2003. The 36 revised full papers presented were carefully reviewed and selected from 75 submissions. All current issues in hybrid systems are addressed including formal methods for analysis and control, computational tools, as well as innovative applications in various fields such as automotive control, the immune system, electrical circuits, operating systems, and human brains.

This book constitutes the refereed proceedings of the International Workshop on Hybrid and Real-Time Systems, HART'97, held in Grenoble, France, in March 1997.
The volume presents 18 revised full papers and 9 short presentations carefully selected during a highly competitive evaluation process; also included are full versions or abstracts of 7 invited papers or tutorials.
Hybrid Systems consist of digital devices interacting with analog environments; thus the emerging area lies at the crossroads of computer science and control theory. This book focusses on mathematically sound methods for the rigorous and systematic design and analysis of hybrid systems and real-time systems.