“…The child must discover it for himself.' (Hall 1970) Nevertheless, there are different investigations, which support a positive answer to the question (Bass and Montague 1972, Case and Fry 1973, Bredderman 1973, Bredderman 1974b, Linn and Thier 1975, Boulanger 1976, Lawson and Wollman 1976, Linn et al 1977, Howe and Mierzwa 1977, Shyers and Cox 1978, Wollman and Lawson 1978, Linn 1980. Moreover, new interpretations of the Piagetian model of cognitive development (Case 1978, Gauld 1979 seem to attribute the failure of training to promote the acquisition of schemata to the inability of the students to process information more than to their inability to master the schemata (at least at the intuitive level).…”