The High Resolution Land Cover CCI consortium (http://cci.esa.int/HRLandcover), in coordination with the European Space Agency (www.esa.int) is willing to involve actively on some crucial steps the scientific community at large through specific Round Robins. Each of these RRs is considered as a way to improve state of the art solutions by learning from the overall community. The goal of the RR activity is to identify the algorithms (or the combination of algorithms) that can achieve the best performance in addressing specific tasks of the processing chain that will be developed by the consortium. The RR will be an open activity in which research groups external to the Consortium will be invited to assess best performing methodologies. The different proposed algorithms will be evaluated through inter-comparison and product validation activities and considering the user expectations. We will announce in this page and through all media the focus and the task of each Round Robin organized by the HRLandCover CCI. You are free to register at any time, and will be informed about the opening of the RR as soon as they start.