- What is a Group?
- BPMN Notation
- BPMN Diagram
- BPMN Standards & Guidelines
The BPMN Group article focus on the definition and usage of the group element as documented in the BPMN 2.0 specification. The example process diagram illustrates the correct use of the group annotation. The BPMN Guidelines section contains a detailed set of rules that apply to the group and explains how the element may or may not be used within the different BPMN diagrams.
What is a Group?
“The Group object is an Artifact that provides a visual mechanism to group elements of a diagram informally.” ~ BPMN Specification
A Group, like a Text Annotation, is a type of Artifact and is used to provide additional information about the Process. A Group is a grouping of graphical elements that are within the same category of which the name appears on the diagram as the group label. Categories can be used for documentation or analysis purposes. A BPMN Group element is one way in which categories of objects can be visually displayed and grouped together on a diagram.
A Group, like all Artifacts, is not an activity or any flow object hence it cannot connect to Sequence Flows or Message Flows. The BPMN Group element groups together a set of activities, but does not affect the sequence flows between the activities within the Group.
A Group can stretch across the boundaries of a Pool since it is not constrained by restrictions of Pools and Lanes. This modelling technique is used to identify and group activities that exist within a distributed business-to-business transaction.
Groups, unlike a Sub-Process, do not add additional constraints for performance when highlighting certain sub clauses of a diagram.
The BPMN specification defines the Group element using the following description and notation:
|Group||A Group is a grouping of graphical elements that are within the same Category. This type of grouping does not affect the Sequence Flows within the Group. The Category name appears on the diagram as the group label.|
The following is an example of a BPMN group within a diagram:
BPMN Standards & Guidelines
The difference between standard and guideline is that a standard is a level of quality or attainment while a guideline is a non-specific rule or principle that provides direction to action or behaviour. A standard are high in authority and needs to be adhered to versus a guideline is low in authority and guide one in setting standards or determining a course of action.
The BPMN Standards section contains a list of rules that are applicable to the BPMN Group as per the official rules of the BPMN Specification.
- A Group is a rounded corner rectangle that MUST be drawn with a solid dashed line .
- A Group can be used within Choreographies and all BPMN diagrams.
The BPMN guidelines section contains a list of optional rules that can be used as a guide.
- A Group SHOULD clearly inform the reader what the group of BPMN element have in common.
- A Group name SHOULD not be more than five words.
This article provided a detailed explanation of the BPMN Group element. Follow me on any of the different social media platforms, and feel free to leave comments.
- Business Process Model and Notation Specification Version 2.0.2. (2014, January). https://www.omg.org/spec/BPMN/2.0.2/