The invention relates to a method for the automated mounting of several add-on parts (3, 3') on a production part (1), particularly on a vehicle body, during which the add-on parts (3, 3') should be fastened to the workpiece (1) whereby being aligned in a positionally precise manner with regard to one another. Each add-on part (3, 3') is held in a mounting tool (5, 5') that is guided by a robot (7, 7'). A sensor system (18, 18'), which is connected in a fixed manner to the mounting tool (5, 5') and which is provided with at least one sensor (19, 19'), is fastened to at least one of the mounting tools (5, 5'). An iterative control process (A-2') is used for displacing the mounting tools (5, 5') with the aid of measured values of the sensors (19, 19') into an anticipation position (23,23') in which the add-on parts (3, 3') that are held inside the mounting tools (5, 5') are aligned in a positionally precise manner with regard to one another. Afterwards, the mounting tools (5, 5'), together with the add-on parts (3, 3'), which are held therein and which are aligned in a positionally precise manner with regard to one another, are guided relative to the production part (1) from the anticipation position (23,23') and into a mounting position (27, 27') in which they are joined to the production part (1).