More and more aspects of concurrency and concurrent programming are becoming part of mainstream programming and software engineering, as a result of several factors, such as the widespread availability of multi-core / parallel architectures and Internet-based systems. Java has been one of the first mainstream languages providing a first-class native support for multi-threading, with basic low level fine-grained concurrency mechanisms. Besides this fine-grained support to concurrency, the identification of higher-level—more coarse-grained—support is important as soon as programming and engineering complex concurrent applications is considered, helping to bridge the gap between system design, implementation and testing.