This book constitutes revised selected papers from the 18th Brazilian Symposium on Formal Methods, SBMF 2015, which took place in Belo Horizonte, Brazil, in September 2015.

The 11 papers presented in this volume were carefully reviewed and selected from 25 submissions. They were organized in topical sections named: model checking; languages and semantics; refinement and verification; testing and evaluation.

This book constitutes the refereed proceedings of the 22nd International Symposium on Formal Methods, FM 2018, held in Oxford, UK, in July 2018The 44 full papers presented together with 2 invited papers were carefully reviewed and selected from 110 submissions.