When to add Model (of MVC) to Interface Builder?

Question

In the Stanford iPhone course CS193P assignment 2 (free online course), the step through says to add the model into the NIB via Cocoa Touch Plugin -> Controllers -> Object. Is this for initialization purpose only? Why can't I just instantiate and initialize my model in the awakeFromNib method within the controller class itself?

Answer 1

You can create the model programmatically, but I find it convenient to let IB take care of it for me.

IB helps you create a singleton, link it to other things and so on.

Answer 2

You shouldn't really be creating model objects in IB. NIBs should really be exclusively for controllers and views. You then write code to create and link models and controllers