This open access book constitutes the proceedings of the 24th International Conference on Fundamental Approaches to Software Engineering, FASE 2021, which took place during March 27–April 1, 2021, and was held as part of the Joint Conferences on Theory and Practice of Software, ETAPS 2021.

FASE Contributions.- On Benchmarking for Concurrent Runtime Verification.- Certified Abstract Cost Analysis.- Bootstrapping Automated Testing for RESTful Web Services.- A Decision Tree Lifted Domain for Analyzing Program Families with Numerical Features.- Finding a Universal Execution Strategy for Model Transformation Networks.- CoVEGI: Cooperative Veri cation via Externally Generated Invariants.- Engineering Secure Self-Adaptive Systems with Bayesian Games.- An Abstract Contract Theory for Programs with Procedures.- Paracosm: A Test Framework for Autonomous Driving Simulations.- Compositional Analysis of Probabilistic Timed Graph Transformation Systems.- Efficient Bounded Model Checking of Heap-Manipulating Programs using Tight Field Bounds.- Effects of Program Representation on Pointer Analyses - An Empirical Study.- Keeping Pace with the History of Evolving Runtime Models.- SpecTest: Specification-Based Compiler Testing.- PASTA: An Efficient Proactive Adaptation Approach Based on Statistical Model Checking for Self-Adaptive Systems.- Understanding Local Robustness of Deep Neural Networks under Natural Variations.- Test-Comp Contributions.- Status Report on Software Testing: Test-Comp 2021.- CoVeriTest with Adaptive Time Scheduling (Competition Contribution).- FuSeBMC: A White-Box Fuzzer for Finding Security  Vulnerabilities in C Programs (Competition Contribution).- Symbiotic 8: Parallel and Targeted Test Generation (Competition Contribution).

This open access book constitutes the proceedings of the 24th International Conference on Fundamental Approaches to Software Engineering, FASE 2021, which took place during March 27–April 1, 2021, and was held as part of the Joint Conferences on Theory and Practice of Software, ETAPS 2021. The conference was planned to take place in Luxembourg but changed to an online format due to the COVID-19 pandemic. The 16 full papers presented in this volume were carefully reviewed and selected from 52 submissions. The book also contains 4 Test-Comp contributions. 

GPSR Compliance The European Union's (EU) General Product Safety Regulation (GPSR) is a set of rules that requires consumer products to be safe and our obligations to ensure this. If you have any concerns about our products you can contact us on ProductSafety@springernature.com. In case Publisher is established outside the EU, the EU authorized representative is: Springer Nature Customer Service Center GmbH Europaplatz 3 69115 Heidelberg, Germany ProductSafety@springernature.com

Open Access This book is licensed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made. The images or other third party material in this book are included in the book's Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the book's Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder.