Explain the head and body interaction partners with an example
Figure 1. Sequence Model of Online Shopping System
The diagram above shows the interaction between human and pages in Online Shopping
System. We can classify the interaction partner into human (customer) and non-human (Website,
Product Page, Shopping Chart Page, Payment Page, Order Review, and Order Confirmation). The head
of the interaction partner are the one that in the rectangle box, which are Website, Product Page,
Shopping Chart Page, Signup/Login Page, Payment Page, Order Review, and the Order Confirmation.
On the other hand, the body is represented as the dashed line that shows the lifetime of the object.
As shown above, the lifeline starts from when the customer browse website and select a product, until
the Order Confirmation page display the Order Number and there is Auto Renewal Date.