Modeling the Checkout Process

[TomTees]

I could use some suggestion on how to model the Checkout Process for my e-commerce site.

 

As I see it, when a person "checks out" there are 5 steps...

 

1.) Create an Account/Log-In

2.) Enter Addresses

3.) Choose Shipping Options

4.) Enter Payment Details

5.) Review & Place Order

 

I'm trying to avoid having gigantic "God classes" and struggling to figure out how to abstract things in good OOP terms.

 

My Head First: Design Patterns book talked about the "State Pattern" and I'm wondering if that might be a good approach? 

 

Maybe each of the 5 steps above could be a "state" in the Checkout Process?

 

What do you think?

 

 

TomTees