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OCR is a low level runtime system designed to map onto a wide range of scalable computer systems. It provides the capabilities needed to support a wide range of programming models including data-flow (when events are associated with data blocks), fork-join (when events enable the execution of post-join continuations), bulk-synchronous processing (when event trees can be used to build scalable barriers and collective operations), and combinations thereof. The Habanero group is actively involved in both the development of the Open Community Runtime (OCR) core and its ecosystem.