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Concurrency is a difficult problem and increasingly difficult to avoid. Hardware isn’t getting faster but multicore platforms are becoming the norm, with even mobile phones containing two or more processors. Concurrency abstractions and patterns -- which are not new, but less widely known -- are helping address many of the challenges seen in this space. In particular the models seen in Clojure, Erlang, Retlang and Event Patterns offer a more testable and reliable approach than the better known threads, locks and semaphores.