Formal Aspects of Component Software

This book constitutes the refereed proceedings of the 20th International Conference on Formal Aspects of Component Software, FACS 2024, held in Milan, Italy, during September 9-10, 2024.The 7 full papers and 1 short paper included in this book were carefully reviewed and selected from 16 submissions. They are organized in topical sections as follows: verification and testing, formal models, and security and blockchain.