In a returning system for service carts (24), said system comprising electronic monitoring of the movement of the carts (24) through an activity area, the main novel features are a) that the returning system is an electronic system operable in a deposit-free manner, the elements of said system being mutually related in a compulsorily activating manner from a collection station, at which the carts stand in readiness to be collected, and via an activity area again back to a readiness collection station, b) that the system comprises an electronic signal director (20) that is both controllable and/or controlling and comprises fixed and variable functions, c) that the system further comprises, c1) mobile electronic communication devices (28) intended and constructed for placement on the system's service carts (24) so as to accompany the latter, each of said communication devices (28) being adapted for electronic identification of the particular service cart on which it is placed, and c2) stationary electronic devices (18) adapted to record the identity of the cart concerned and to be connected for communication to said signal director (20), said stationary devices (18) being placed in a mutual sequence in such a manner that they co-operate to form a path of advancement extending from a cart-collection station (14, 15), through said activity area, and back to a cart-collection station (14, 15), said path to be followed by the service carts (24) for triggering electrical signals for the activation of the signal director (20), and d) that said signal director (20) is connected for communication with an indicator (17, 30) adapted to make known the giving of a reward caused by the returning of a cart.