The invention relates to a method for monitoring and/or controlling a transport device (10) wherein a plurality of similar products (17), in particular printed products, such as newspapers, magazines or similar are held in a detachable manner by means of individual clamps (12) that are arranged in a row, one behind the other, and are transported in sequence along a transport path (19). Improved operational reliability and controllability is characterized in that a contract-free read-in or read-out tag (T1-T5, Tn) is provided on the clamps (12), and that a reading-in/reading-out device (30) is disposed in the vicinity of the respective clamp for reading-in or reading-out data in the tags of a clamp (12), and is displaced with the respective clamp (12) over a selected section of the transport path (19).