A website can be divided into pieces a lot of different ways. You can divide up the process of development into stages, or you can look at the individual parts. But a website is not like a car. The pieces don’t screw together or came apart in the same way. What makes a website work is the interaction between components that are separated in space and, possibly, time. Some of the pieces are more theoretical, such as the layout and the navigation structure. It’s like the frame of the car, except that you can’t actually see the frame. Just the things hanging on it.