1 2 3 4 5 of payment a Self service comprises the following order of steps gas Customer selects station 1 2 3 4 5 into your car for full service and for seir service Assume that paying cash is the only means Customer pumps desired amount of gas and performs other services Customer selects station Pay cashier for gas and other products inside station Return to auto and drive off Select octane level b Full service comprises the following order of steps Attendant pumps desired amount of gas and performs other services Customer selects station Drive off Pay attendant for gas and other services