This book constitutes the refereed proceedings of the 7th International Conference of B Users, B 2007, held in Besancon, France in January 2007.

The 30 revised full papers presented together with 4 invited contributions were carefully reviewed and selected from numerous submissions. The topics of interest to the conference included: industrial applications and case studies using B, integration of model-based specification methods in the software development lifecycle, derivation of hardware-software architecture from model-based specifications, expressing and validating requirements through formal models, in particular verifying security policies, theoretical issues in formal development, model-based software testing, tools supporting the B method, development by composition of specifications, validation of assembly of COTS by model-based specification methods, B extensions and/or standardization.

This book constitutes the thoroughly revised selected papers from the 13th International Conference on Formal Aspects of Component Software, FACS 2016, held in Besancon, France, in October 2016. The 11 full papers presented together with one tool paper and 3 invited papers were carefully reviewed and selected from 27 submissions. FACS 2016 is concerned with how formal methods can be used to make component-based and service-oriented software development succeed. Formal methods have provided a foundation for component-based software by successfully addressing challenging issues such as mathematical models for components, composition and adaptation, or rigorous approaches to verification, deployment, testing, and certification.