It is important to remember that Piaget was the first to point out that the qualitive change in the nature of mental ability is to be expected at or around puberty. We may also add that before Piaget’s work, the common assumption in psychology was that children are merely less competent thinkers than adults. Piaget showed that young children think in strikingly different ways compared to adults (McLeod, 2009). According to Piaget, children are born with a very basic mental structure on which all