As we discussed, within a Business Process Diagram (BPD) elements are categorized allowing users to easily understand the diagrams. There are a set of core elements that have been defined in a BPD allowing users to start creating the essential gist of a process. These core elements can be further elaborated to take care of the complexities, while still maintaining the standard look and feel of the diagrams. These core elements are subdivided into four categories, each of which contains a specific set of elements, as shown in the following figure.

Flow objects consist of the backbone elements in a business process diagram, and are used to represent the basic behaviour of any process. These elements are events, activities and gateways. Events represent the various states relevant for the business process, such as the start of the process, wait time in a process, the termination of a process, and so on. Activities denote the work conducted as the part...