SysML Requirement Diagram
SysML Requirement diagrams are used to model and visualize the requirements of a system or a project. These diagrams are built using a set of specific elements, each of which plays a unique role in the overall requirements model. In this tutorial, we will take a closer look at each of these elements, and explain how they can be used to create an effective and informative SysML Requirement diagram.
SysML Requirement Diagram Elements
In this section, we will explore the individual elements of the SysML Requirement Diagram, including Requirement, Test Case, Block, Stakeholder, Copy, Derive Requirement, Satisfy, Verify, Refine, and Trace.
One of the key elements of the SysML Requirement diagram is the Requirement element, which represents a specific requirement or constraint that must be met by the system.
This element includes the id, name, and text of the requirement. The element can be connected to other elements in the diagram to show the relationships between requirements.
Test Case Element
The Test Case element represents a test or scenario that is used to verify that a requirement is met. A test case has properties such as a name, a precondition, and a postcondition. A test case can be linked to a requirement to show how it is used to verify that requirement.
The Block element is used to represent a physical or functional component of the system. In the Requirement diagram, a SysML block can be linked to requirements to show how it meets those requirements or how it is related to them.
The Stakeholder element is used to represent a person or organization that has an interest in the system or project. It can be used to describe the role of the stakeholder and can be connected to other elements in the diagram to show the relationships between stakeholders and requirements.
The Copy connector can be used to indicate the duplication of another requirement. It can also be used to show that a requirement is being reused or that there is a similar requirement.
Derive Requirement Relationship
The Derive Requirement connector is used to indicate that one requirement is derived from another requirement. It can be used to show that a requirement is based on another requirement.
The Satisfy connector represents a relationship between a requirement and a block, indicating that the block satisfies the requirement.
The Verify connector represents a relationship between a requirement and a test case, indicating that the test case is used to verify that the requirement is met. The Verify connector arrow points from a test case to a Requirement element.
The Refine connector represents a relationship between two requirements, indicating that one requirement refines or breaks down other smaller requirements.
The Trace connector represents a relationship between two elements, indicating that they are related in some way. This element can be used to link requirements, test cases, blocks, and stakeholders together to show how they are related.
SysML Requirement Example
This example demonstrates how SysML Requirement Diagram allows capturing the functional requirements of a system in a clear and structured manner, and how it can be used to trace the requirements to the system's design and implementation. It also highlights how different elements of the diagram can be used to represent different aspects of the system and its requirements, and how the relationships between the elements can be used to capture the traceability links between them.