This book constitutes the thoroughly refereed post-workshop proceedings of the 4th International Workshop on Structured Object-Oriented Formal Language and Method, SOFL+MSVL 2014, held in Luxembourg, Luxembourg, in November 2014. The 12 papers presented in this volume were carefully reviewed and selected from 20 submissions. They are organized in topical sections on testing and inspection; model checking and animation; education and verification; and semantics and analysis.