A system for assessing the performance of a harvesting head for harvesting crops from a field includes a first sensor for sensing an expected amount of crop within the harvesting head, a second sensing arrangement for sensing an amount of crop within the harvesting head, and an electronic control unit. The electronic control unit compares the expected amount of crop with the sensed amount of crop, and provides an output signal indicating a malfunction of the harvesting head in case the expected amount of crop deviates from the sensed amount of crop.
