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All the pieces are fitting together:
The nibs (*.xib) describe the interface.
iDecide is made up of two nibs: the MainWindow.xib and our iDecideViewController.xib. Together, these describe the UI the user sees.
The views are connected to the code in the View Controller.
Our views are connected to the implementation code through Interface Builder using IBOutlets and IBActions. IBOutlets give us references to UI components, and IBActions are called when events happen.
Our application behavior is implemented in our View Controller.
Following the MVC pattern (or really, just the VC pattern), we have all of our behavior implemented in our View Controller, cleanly separated from the view itself. The View Controller uses IBOutlets to get back to our actual UI controls if it needs to update them.