This book constitutes the refereed proceedings of the 21st Ada-Europe International Conference
on Reliable Software Technologies Ada-Europe 2016 held in Pisa Italy in June 2016. The
revised 12 full papers presented together with one invited paper were carefully reviewed and
selected from 28 submissions. They are organized in topical sections on concurrency and
parallelism testing and verification program correctness and robustness and real-time
systems.
