Having looked at the core elements of BPMN from an understanding perspective, it is now essential to understand the various elements in detail and see what extensions BPMN provides to each of the elements to create truly illustrative and complete business process diagrams. Business analysts will realize that BPMN, apart from allowing easy process building, also provides sufficient detail and variety to allow a modeler to capture the complexities of real-life processes. It is also essential to understand how understanding these elements in detail will help the designers of business process and the respective IT teams later on to provide enough detail in a process to allow successful mapping from the process design to its execution in a BPM engine. Let's understand in some detail the main BPMN elements.