1. In attended service mode, the settlement of the transaction takes place before the customer leaves the site of the delivery. 2. A transaction is settled when the parties interested in the transaction have made their agreement known (explicitly or implicitly) as regards the amount of the transaction. This may be a payment, signing a credit card voucher, signing a delivery order, etc. 3. The parties interested in a transaction may be the parties themselves or their representatives (for example: an employee in a filling station, or the driver of a truck). 4. In attended service mode the measurement operation ends at the moment settlement of the transaction takes place.