Model checking community has achieved many breakthroughs, bridging the gap between theoretical computer science and hardware and software engineering, and reach into areas that are full of new challenges such as biological systems and hybrid systems. Model checking has been introduced into the curriculum of computer science and electrical engineering at universities around the world and has become a universal tool for system analysis. This book is a collection of articles, published in celebration of 25th anniversary of Model Checking, including a collection of 11 papers were invited on the basis of talks at the symposium "25 Years of Model Checking",, 25MC, which is part of the 18th International Conference on Computer Aided Verification (CAV 2006), which in turn is part of the Federation of Logic Conference (floc 2006), held in Seattle, WA, United States, in August 2006. Model checking is currently attract attention outside the core technical community, and the ACM Turing Award 2007, awarded in recognition of his paradigm-shifting work on this topic began a quarter century ago.