Task: Define Use-Case System Context

This task translates a use case and its associated actors into relevant blocks in a SysML structure diagram (Internal Block Diagram).

Purpose

To define the constituents of an executable use-case model so that the use case can be validated through model execution.

Relationships

Roles	Primary: Requirements Engineer	Additional:	Assisting:
Inputs	Mandatory: System Use Case	Optional: None	External: None
Outputs	System Use-Case Internal Block Diagram

Main Description

This task is the first step in the process of building an executable model of a use-case. It begins with the definition of a use-case block and actor(s) blocks that represent the respective use case and associated actors. At this stage, the blocks are empty and not associated.

Steps

Define Use-Case Block

Create a SysML block that represents the subject use case. Name the block the same as the corresponding use case.

Define Actor Block(s)

Review the use-case model to identify actors that participate in the subject use case. Create SysML block(s) to represent each of the associated actor(s). Name these blocks the same as the corresponding actors.

Create Internal Block Diagram

Create a SysML Internal Block Diagram (IBD) containing SysML parts for each of the blocks created in the previous steps.

More Information

Guidelines	Creating a Block Definition Diagram Creating an Internal Block Diagram
Tool Mentors	Creating an Use-Case Model in Rhapsody SE Creating a Project in Rhapsody SE