This stage is seen as the biggest change so far in a child's life as logical and operational thinking is developed. During this phase the child improves in conservation tasks. The child's logic is applied to physical aspects but not yet to other concrete operational aspects. It is at this stage that we first see the similarities between the thinking of a child and that of an adult as thoughts tend to be more sensible and logical. Evidence to support this would be the Piaget test using counters; he arranged a row of 6 markers for the child and asked him to make an identical row. Then one of the rows of checkers was widened and the child was asked if there were still the same number of checkers there. As the child developed through this stage, he would see that there were still the same amount of tokens, thus concluding Piaget's experiment that as the child gets older their retention improves. In 1974 Rose and Blank repeated one of Piaget's experiments but only asked the child the question whether after pouring liquid from a glass into a glass of a different shape there was the same amount of liquid in the glass once (McLeod, 2009) . They found that more six-year-olds gave the correct answer, leading us to believe that children can retain at a younger age. It is believed that when an adult repeats the question the child then believes that the first answer was wrong