SCENARIOS
It is an instance of a use case describing concrete set of actions. Scenarios are used as examples for illustrating common cases. Their focus is on understandability.
Use cases are used to describe all possible cases. Their focus is on completeness. We describe a scenario using the template with three fields:
Ø The name of the scenario enables us to refer to it unambiguously.
Ø The participating actor instances field indicates which actor instances are involved in this Scenario.
Flow of events of a scenario describes the sequence of events step by step.USE CASE MODEL OF THE SYSTEM
Use Case Diagrams
Use Case diagrams identify the functionality provided by the system (use cases), the users who interact with the system (actors), and the association between the users and the functionality. Use Cases are used in the Analysis phase of software development to articulate the high-level requirements of the system. The primary goals of Use Case diagrams include:
- Providing a high-level view of what the system does
- Identifying the users ("actors") of the system
- Determining areas needing human-computer interfaces
Use Cases extend beyond pictorial diagrams. In fact, text-based use case descriptions are often used to supplement diagrams, and explore use case functionality in more detail.
No comments:
Post a Comment