2. Use Case Example 1

•     LOG-IN ( to a computer system )
  

1. The user is prompted for the user name and for the password.

2. The system verifies the user's name and the password...

   • ...and if correct, displays the main menu.

3. If the user's name and/or password are not correct the system displays the error message...

   • ...after the user acknowledges the message by pressing a key,
     the system asks the user to enter the user's name and the password again.