1. System analysis and design
Safaa s.y. dalloul

2. Use Cases

3. Unit 5: Use cases Building Use Case Introduction
Elements of use case
Basic Information
Inputs and Outputs
Details
Building Use Case
Identify the major use cases
Identify the major steps within each use case
Identify elements within steps
Confirm the use case
Cycle through the above steps iteratively

4. Introduction
A use case is a formal way of presenting how a business system interacts with its environment.
A use case depicts a set of activities performed to produce some output result.
Each use case describes how an external user triggers an event to which the system must respond.

5. Why do you think we need to draw the use cases?
Introduction
Why do you think we need to draw the use cases?

6. Introduction
To help us better understand the situation and help make the following design step simpler.
It is also important to create use cases when we are reengineering processes.
When creating use cases, the project team must work closely with the users to gather the information needed.

7. Determine the elements of Use Case

8. Elements of use case
A use case contains fairly complete description of all the activities that occur in a response to a trigger event.
While there are numerous pieces of information in the use case, the information is organized into three main parts: basic information, inputs and outputs, and details.

9. Basic Information
Inputs
Outputs
Details

10. Elements of use case Basic Information
Each use case has a name and number, the number is simply a sequential number that serves to reference each use case.
The importance level maybe assigned to indicate the relative significance of the use case in the overall system.

11. Elements of use case Basic Information
The primary actor refers to the external user that triggers the event to which the system response.
Another element of basic information is the trigger for the use case.
Use cases are written from the bird's eye view of the system.

12. Elements of use case Inputs and Outputs
Each of the major inputs and outputs to the system case described along with their sources or destination.
These are all possible inputs and outputs.
Building case is a gradual sharing work for analysts and users.

13. Elements of use case Details
These steps are the activities that are performed during the use case, such as taking patient name and address, check for appointment and so on.
These steps are listed in the order in which they are performed and any conditional steps are clearly noted.

14. Building use cases Process of Developing Use Case
Identify the major use cases
Identify the major steps within each use case
Identify elements within steps
Confirm the use case
Cycle through the above steps iteratively

15. Building use cases Process of Developing Use Case
Identify the major use cases
Activities
Start a use case form for each use case.
If more than nine, group into packages

16. Building use cases Process of Developing Use Case
Identify the major use cases
Questions
Ask who, what, and where about the tasks and their inputs and outputs
What are the major tasks performed?
What triggers this task? What tells you to perform this task?

17. Building use cases Process of Developing Use Case
Identify the major use cases
Questions
What information/forms/reports do you need to perform this task?
Who gives you these information/forms/reports?
What information/forms/reports does this produce and where do they go?

18. Building use cases Process of Developing Use Case
Identify the major steps within each use case
Activities
For each use case, fill in the major steps needed to process the inputs and produce the outputs

19. Building use cases Process of Developing Use Case
Identify the major steps within each use case
Ask how about each use case:
How do you produce this report?
How do you change the information on the report?
How do you process forms?
What tools do you use to do this step (e.g., on paper, by , by phone)?

20. Building use cases Process of Developing Use Case
Identify elements within steps
Activities
For each step, identify its triggers and its inputs and outputs

21. Building use cases Process of Developing Use Case
Identify elements within steps
Ask how about each step
How does the person know when to perform this step?
What forms/reports/data does this step produce?

22. Building use cases Process of Developing Use Case
Identify elements within steps
Ask how about each step
What forms/reports/data does this step need?
What happens when this form/report/data is not available?

23. Building use cases Process of Developing Use Case Confirm the use case
Activities
For each use case, validate that it is correct and complete
Question
Ask the user to execute the process using the written steps in the use case – that is, have the user role-play the use case

24. Building use cases Process of Developing Use Case
Cycle through the above steps iteratively
For each use case, perform the previous steps, and maybe you'll need to update one use case depending of new information that could catch.

25. Role-Play

26. Safaa S.y. dalloul
Safaadalloul.wordpress.com
Thank You