Drawing usecase for Enter Phone number scenario - Beginner

Question

I need to draw a usecase that will expect the user to enter the phone number. But the user will be given 2 attempts to enter the phone number. If both 2 attempts fail, then he will be asked to sign in to the system. How can i draw the usecase for this system ?

What i want to show:

1.) I want to show that a user can only attempt 2 tries to enter the phone number, If both attempts were wrong he will be asked to Login to the system.

Answer 1

That's not something to be modeled on use-case diagram. Such resolution is reserved to a lower-level modeling corresponding to your Login to the system use-case, such as sequence or activity diagram.

Answer 2

Definitely agree. Use a sequence diagram to model behavior. Use-cases should be used to show high-level interaction with the system. In your case, two use cases: Login to the system and Enter Phone #