This book presents the refereed proceedings of the Second International B Conference, B'98, held in Montpellier, France, in April 1998. The book presents 15 revised full papers selected from 29 submissions as well as four invited contributions. The B method is enjoying rapidly increasing popularity for the specification and design of software. The book covers all aspects of the B technology, including introductory and methodological issues, theoretical investigations and industrial applications, B extension proposals and support tools, as well as comparisons or integration with other formal methods for software development.