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The event model of a system determines how events are defined and generated, and how events are notified to interested components. In this chapter we look at key differences between the event model in distributed event based systems (DEBSs) and event models found in other implicit invocation systems. We identify features common to all DEBS event models, and variations within different DEBSs implementations. The main goal of the chapter is to elicit important features in event models that need to be supported in the engineering of DEBS applications.