The book constitutes the refereed proceedings of the 9th International Conference on Verification, Model Checking, and Abstract Interpretation, VMCAI 2007, held in San Francisco, USA, in January 2008. The 21 revised full papers presented together with 2 invited lectures and 2 invited tutorials were carefully reviewed and selected from a total of over 60 submissions. The papers feature current research from the communities of verification, program certification, model checking, debugging techniques, abstract interpretation, abstract domains, static analysis, cross-fertilization, and...