Proceedings of: 11th International Work-Conference on Artificial Neural Networks (IWANN 2011). International Workshop of Intelligent systems for context-based information fusion (ISCIF 11). Torremolinos-Málaga, Spain, June 8-10, 2011 In most of the domains of the context-aware system the user make up a group and their behavior could be research with group behavior recognition techniques. Our approach try to take advantage of the context information to understand the user's behaviors like a group, and this information could be useful for other system to beat to the users. For this purpose it is exposed a new representation that concentrates all necessary information concerning relations two to two present in the group, and the semantics of the different groups formed by individuals and training (or structure) of each one of them. This work was supported in part by Projects CICYT TIN2008-06742-C02-02/TSI, CICYT TEC2008-06732-C02-02/TEC, CAM CONTEXTS (S2009/ TIC-1485) and DPS2008-07029-C02-02. Publicado