This book constitutes the thoroughly refereed post-conference proceedings of the 4th International Haifa Verification Conference, HVC 2008, held in Haifa, Israel in October 2008.

The 12 revised full papers and 4 tool papers presented together with 6 invited lectures were carefully reviewed and selected from 49 initial submissions. The papers address all current issues, challenges and future directions of verification for hardware, software, and hybrid systems and present academic research in the verification of systems, generally divided into two paradigms - formal verification and dynamic verification (testing). Within each paradigm, different algorithms and techniques are used for hardware and software systems with a special focus on hybrid methods.