Checkout designed to give flexibility of use to the row of checkouts, with the possibility of rapid and simplified conversion from normal assisted use to self-checkout use and vice versa, of the type that comprises in operational sequence a conveyor belt on which the products are loaded, an intermediate scanning and payment unit, and an end tray (V, V') where the checked products are collected in normal assisted check-out mode, which checkout comprises: - In combination with the checkout a first and a second passageways for customer extending each along one of two opposite sides of the checkout; - One of the two passage ways being alternatively occupied by the assistant, while the other passageway being destined to the passing of the customer in the assisted mode; - means comprising a scanner, a till, a printer, an automatic device for cash payments a keypad for electronic payments and a touch screen interface being used in both assisted and self-checkout modes and a dedicated self-checkout software interface allowing the customer in the self-checkout mode to place the acquired products on the initial conveyor belt, read the barcode of each product at the intermediate unit, to pay the cost of the purchases by an agreed means and to bag the products after the scanning phase in an end space; - the said end space being an area immediately downstream of said intermediate unit; characterized in that it comprises means allowing said intermediate unit to be used alternatively by the assistant in the assisted check-out mode or in the self-checkout mode, directly by the customer on the same side as that occupied by the assistant in the assisted check-out mode; and in that - the said end tray (V,V') being fitted with means for displacing it by rotation, or pivoting and/or translation from a position in which it occupies the said area to an out-of-the-way position in which the end tray has been moved away from the said area. - In combination with the checkout a first and a second passageways for customer extending each along one of two opposite sides of the checkout; - One of the two passage ways being alternatively occupied by the assistant, while the other passageway being destined to the passing of the customer in the assisted mode; - means comprising a scanner, a till, a printer, an automatic device for cash payments a keypad for electronic payments and a touch screen interface being used in both assisted and self-checkout modes and a dedicated self-checkout software interface allowing the customer in the self-checkout mode to place the acquired products on the initial conveyor belt, read the barcode of each product at the intermediate unit, to pay the cost of the purchases by an agreed means and to bag the products after the scanning phase in an end space; - the said end space being an area immediately downstream of said intermediate unit; characterized in that it comprises means allowing said intermediate unit to be used alternatively by the assistant in the assisted check-out mode or in the self-checkout mode, directly by the customer on the same side as that occupied by the assistant in the assisted check-out mode; and in that - the said end tray (V,V') being fitted with means for displacing it by rotation, or pivoting and/or translation from a position in which it occupies the said area to an out-of-the-way position in which the end tray has been moved away from the said area.