This book constitutes the refereed proceedings of the workshops which complemented the 23rd Symposium on Formal Methods, FM 2019, held in Porto, Portugal, in October 2019. This volume presents the papers that have been accepted for the following workshops: Third Workshop on Practical Formal Verification for Software Dependability, AFFORD 2019; 8th International Symposium From Data to Models and Back, DataMod 2019; First Formal Methods for Autonomous Systems Workshop, FMAS 2019; First Workshop on Formal Methods for Blockchains, FMBC 2019; 8th International Workshop on Formal Methods for Interactive Systems, FMIS 2019; First History of Formal Methods Workshop, HFM 2019; 8th International Workshop on Numerical and Symbolic Abstract Domains, NSAD 2019; 9th International Workshop on Open Community Approaches to Education, Research and Technology, OpenCERT 2019; 17th Overture Workshop, Overture 2019; 19th Refinement Workshop, Refine 2019; First International Workshop on Reversibility in Programming, Languages, and Automata, RPLA 2019; 10th International Workshop on Static Analysis and Systems Biology, SASB 2019; and the 10th Workshop on Tools for Automatic Program Analysis, TAPAS 2019.

This book constitutes the refereed proceedings of the 4th International Workshop and Tutorial, FMTea 2021, Held as Part of the 4th World Congress on Formal Methods, FM 2021, as a virtual event in November 2021. The 8 full papers presented together with 2 short papers were carefully reviewed and selected from 12 submissions. The papers are organized in topical sections named: experiences and proposals related with online FM learning and teaching, integrating/embedding FM teaching/thinking within other computer science courses, teaching FM for industry, and innovative learning and teaching methods for FM.

Part I of this book is a practical introduction to working with the Isabelle proof assistant. It teaches you how to write functional programs and inductive definitions and how to prove properties about them in Isabelle’s structured proof language. Part II is an introduction to the semantics of imperative languages with an emphasis on applications like compilers and program analysers. The distinguishing feature is that all the mathematics has been formalised in Isabelle and much of it is executable. Part I focusses on the details of proofs in Isabelle; Part II can be read even without familiarity with Isabelle’s proof language, all proofs are described in detail but informally. The book teaches the reader the art of precise logical reasoning and the practical use of a proof assistant as a surgical tool for formal proofs about computer science artefacts. In this sense it represents a formal approach to computer science, not just semantics. The Isabelle formalisation, including the proofs and accompanying slides, are freely available online, and the book is suitable for graduate students, advanced undergraduate students, and researchers in theoretical computer science and logic.

Hybrid systems are models for complex physical systems and have become a widely used concept for understanding their behavior. Many applications are safety-critical, including car, railway, and air traffic control, robotics, physical–chemical process control, and biomedical devices. Hybrid systems analysis studies how we can build computerized controllers for physical systems which are guaranteed to meet their design goals. The author gives a unique, logic-based perspective on hybrid systems analysis. It is the first book that leverages the power of logic for hybrid systems. The author develops a coherent logical approach for systematic hybrid systems analysis, covering its theory, practice, and applications. It is further shown how the developed verification techniques can be used to study air traffic and railway control systems. This book is intended for researchers, postgraduates, and professionals who are interested in hybrid systems analysis, cyberphysical or embedded systems design, logic and theorem proving, or transportation and automation.

This Festschrift, dedicated to Klaus Havelund on the occasion of his 65th birthday, celebrated in 2021 due to the COVID-19 pandemic, contains papers written by many of his closest friends and collaborators. After work as a software programmer in various Danish companies, Klaus has held research positions at various institutes, including the Danish Datamatics Center, the Ecole Polytechnique, LIP 6 lab in Paris, Aalborg University, and NASA Ames. Since 2006 he has been working in NASA’s Jet Propulsion Laboratory (JPL), the federally funded center managed by Caltech whose primary function is to construct and operate planetary robotic spacecraft. His professional awards include the Turning Goals Into Reality engineering innovation award, the Outstanding Technology Development award, and the JPL Mariner, Ranger, Voyager, and Magellan awards. Klaus has provided constant and generous service to the formal methods community by organizing, participating in, and chairing numerous committees. His academic awards include the 2020 SIGSOFT Impact Paper Award, the RV 2018 Test of Time award, and the ASE 2014 and ASE 2016 Most Influential Paper awards. His research activities have generated more than 100 publications with more than 100 collaborators, cited over 12,000 times. The book title reflects Klaus’s main research and engineering focus throughout his career: formal methods, often applied at NASA. The contributions, which went through a peer-review process, cover a wide spectrum of the topics related to his scientific interests, including programming language design, static analysis, runtime verification, dynamic assurance, and automata learning.

This book constitutes the refereed proceedings of the International Symposium of Formal Methods Europe, FME 2003, held in Pisa, Italy in September 2003. The 44 revised full papers presented together with 5 invited papers were carefully reviewed and selected from 144 submissions. The papers are organized in topical sections on industrial issues, control systems and applications, communication system verfication, co-specification and compilers, composition, Java, object-orientation and modularity, model checking, parallel processes, program checking and testing, B method, and security.