Technical stuff Requirements are like water. They're easier to build on when they're frozen.

1. You go to the yUml site and throw some data in the text box offered
2. Press “Generate the Diagram!”
3. Voila!

And here’s an example, as well:

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http://yuml.me/diagram/scruffy;scale:60/usecase/[Admin]^[User Free], [Admin]^[User Premium], [Admin]-(note: Most privileged user), [User Free]-(note: No costs), [User Premium]-(note: Monthly subscription), [User Free]-(Login), [User Free]-(Logout) , [User Premium]-(Login), [User Premium]-(Logout) , (Login)<(Reminder) , (Login)>(Captcha).

[/sourcecode]

See it in action.