Hi @gloria_macia_munoz - some of the segmentations, as the one you identified, have been done by humans under time constraints. Those can certainly be improved. As we get better and better algorithms, more and more high quality data will become available for this challenge, in future rounds. It’s very important to note that this will be a long-term challenge / benchmark. This is just the first round, with the data that was provided. Over time, both the quantity and the quality will increase.