Discuss about transaction mapping by considering the below example.

We are after a system that controls a recycling machine for returnable bottles and cans. The

machine will allow a customer to return bottles or cans on the same occasion.

When the customer returns an item, the system will check what type has been returned. The

system will register how many items each customer returns and, when the customer asks for

a receipt, the system will print out what he deposited, the value of the returned items and the

total return sum that will be paid to the customer.

The system is also be used by an operator. The operator wants to know how many items of

each type have been returned during the day. At the end of the day, the operator asks for a

printout of the total number of items that have been deposited in the machine on that

particular day. The operator should also be able to change information in the system,

such as the deposit values of the items. If something is amiss, for example if a can gets

stuck or if the receipt roll is finished, the operator will be called by a special alarm signal.