Competitive sport is one of the key contexts in the development of values through sport, given the very significant ambivalences and contradictions involved within sport. Since the 2008-09 season the Real Madrid Foundation has launched in its basketball schools an educational project of transmission of values called "For a REAL Education: Values and Sport", which has led to the development of different teaching materials including the "White Card" program, an educational resource that tries to encourage good sportsmanship and moral development of participants. The aim of this work is to analyze how useful the program is to both trainers and families. The program has been applied to 338, 356 and 334 players aged between 8 and 17, by 16, 15 and 18 teachers in 2010-11, 2011-12 and 2012-13 seasons respectively. The methodology used in intervention has been action research and the instruments used for data collection were group discussion, questionnaire, survey and our own white cards given to players in tournaments. The assessment of this resource has been very positive from the coaches, and a high percentage, of parents of the young athletes.