The frequent use of false beliefs, as tasks that account for the level of understanding that children have the mind of others, has received significant criticism (Bloom & German, 2000).New methodological alternatives emerged in the 80's (e.g., Chandler, Fritz & Hala, 1989) in order to ensure that children through genuine capacity to deceive, demonstrating a level of understanding of the mind of others. Currently, the debate is in force (Newton, Reddy & Bull, 2000; Reddy, 2008) but has taken different paths. The article tries to recreate this debate and show that the methodologies used so far have prevented significant mental abilities study in children under 3 years.