I'd like to spend this lesson on some more elaboration of the MVVM architecture model. Ideally, we'll want to set up our <b>RegistrationViewModel</b> object to reflect what we have in our RegistrationController page. This way we can keep track of all the appropriate properties inside a single class. To make our code much easier to write, we'll introduce the construct of a <b>Bindable</b> that allows for binding from external classes. Lots to learn and you'll see these patterns a lot in Reactive style programming.