Detailed Use Case

Prepared by: [Your Name]

Title: User Login

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I. Actor

• User (the individual trying to access their account)

II. Preconditions

• The user must have an existing account with valid login credentials (username and password).

• The system must be operational and accessible.

III. Triggers

• The user navigates to the login page of the application.

IV. Basic Flow

1. User Action: The user enters their username and password into the login form.

2. System Response: The system validates the credentials.

3. User Action: The user clicks the "Login" button.

4. System Response: The system verifies the credentials and, if correct, grants access to the user’s account.

5. System Response: The user is redirected to their account dashboard or the homepage.

V. Alternate Flows

Alternate Flow 1: Incorrect Password

1. User Action: The user enters a correct username but an incorrect password.

2. System Response: The system detects the incorrect password.

3. System Response: The system displays an error message indicating that the password is incorrect.

4. User Action: The user can attempt to re-enter the password or click on a “Forgot Password” link.

Alternate Flow 2: Username Not Found

1. User Action: The user enters a username that does not exist in the system.

2. System Response: The system detects that the username is not found.

3. System Response: The system displays an error message indicating that the username is not found.

VI. Postconditions

• The user is logged in and has access to their account or is informed of the login failure.

VII. Exceptions

Exception 1: System Down

1. User Action: The user attempts to log in while the system is down or experiencing issues.

2. System Response: The system is unable to process the login request.

3. System Response: The system displays a message indicating that the system is temporarily unavailable and suggests trying again later.

Exception 2: Network Failure

1. User Action: The user attempts to log in but encounters a network failure.

2. System Response: The login attempt fails due to the network issue.

3. System Response: The system displays an error message indicating a network problem and prompts the user to check their connection.

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