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What is the purpose of use cases in the analysis phase of the SDLC?
What is the purpose of use cases in the analysis phase of the SDLC?
to define the expected interaction between the user and the system and clarify user requirements
What is a use case diagram typically used in conjunction with?
What is a use case diagram typically used in conjunction with?
Each use case must have a name, number, and description.
Each use case must have a name, number, and description.
True
In a use case, the trigger refers to the __ that causes the use case to begin.
In a use case, the trigger refers to the __ that causes the use case to begin.
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Match the following use case element with its description:
Match the following use case element with its description:
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Study Notes
Use Case Analysis
- Use cases are used to illustrate how a system interacts with its environment, showing the activities performed by users and the system's responses.
- Use cases express and clarify user requirements, defining the expected interaction between the user and the system.
- Use cases are used extensively in the analysis phase, often as part of user interviews or JAD (Joint Application Development) sessions.
Use Cases Techniques
- Visual modeling: use case diagrams are used to graphically depict a subset of the use case model to simplify communications.
- Textual document: use case specifications describe the flow of events of the use case.
Elements of a Use Case
- Each use case has a name and number, and brief description.
- Priority may be assigned to indicate the relative significance.
- The actor refers to a person, another system, or a hardware device that interacts with the system to achieve a useful goal.
- The trigger for the use case is the event that causes the use case to begin.
Use Case Styles
- Use case styles can be casual, fully-dressed, or others.
- Fully-dressed use case format is very thorough, detailed, and highly structured.
Creating Use Cases
- Identify events the system must respond to, and develop an Event-Response List.
- Create use case forms for the complex events.
- For each use case, identify the major steps, identify elements with each major step (inputs and outputs), and confirm use case with users through role-playing.
- Revise functional requirements as needed.
Use Case Practical Tips
- Use gradual refinement, concentrating on describing the user's objectives with the system completely and accurately.
- Keep both audiences in mind – users and developers.
- Create use cases only when needed to clarify what the system must do from the user's perspective, not needed for simple events.
Use Cases in Sequence
- Use cases are often performed in sequence, and no single use case should be too large.
- It's important to define initial and ending states.
Preconditions and Postconditions
- Preconditions define what must be complete before beginning the use case.
- Postconditions define what is complete when the use case ends.
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Description
This quiz covers the importance of use cases in the analysis phase of the Software Development Life Cycle (SDLC). It explains the different parts of a use case, their purposes, and how they contribute to functional requirements and test plans.