Complex Event Processing (CEP) is a set of technologies that allows events to be processed on a continuous basis. TIBCO offers a complete platform to enable CEP that is, TIBCO BusinessEvents. It is a Rule Engine where Event-Based Programming Paradigm is followed that has Java at its core. CEP is unlike conventional event processing technologies, however, in that it treats all events as potentially significant and records them asynchronously. CEP Applications are event-driven in nature, therefore some of its aspect has real-time behavior. For example, “Situation Awareness,” “Sense and Respond,” or “Track and Trace” are some of the aspects that CEP application can have that overlap in actual business situations. Learning TIBCO BusinessEvents (BE) for developing such CEP Solution can open up the world of Even Processing for developers. TIBCO BusinessEvents Rule Engine's working can't be understand without understanding what "Run to Completion" Cycle is