Composite Event Recognition (CER for short), also known as Complex Event Recognition, refers to the activity of detecting patterns in streams of continuously arriving “event” data over (geographically) distributed sources. CER is a key ingredient of many contemporary applications that require the processing of such event streams in order to obtain timely insights and implement reactive and proactive measures. The objective of this Dagstuhl Seminar was to:

• bring together world-class computer scientists and practitioners working on CER, Distributed Systems, Databases, Logic, Stream Reasoning and Artificial Intelligence;
• disseminate the recent foundational results in each of these isolated fields among all participants;
• identify the open problems that need to be resolved to provide general formal foundations of CER;
• establish new research collaborations among these fields; thereby
• start making progress towards formulating such foundations.