This stage is considered the biggest change so far in a child's life, as logical and operational thinking develops. During this stage, the child improves at conservation tasks. The child's logic applies to physical aspects but not yet to other, therefore concrete operational aspects. It is at this stage that we first see similarities between a child's thinking and that of an adult, as the thoughts tend to be more sensible and logical. The supporting evidence would be the Piaget test using the meters; he placed a row of 6 tokens for the child and asked him to make an identical row. We then spread out one of the rows of tokens and ask the child if there are always the same number of tokens. As the child developed through this stage, he would see that there were always the same number of tokens, thus concluding Piaget's experiment that as the child grows, his conservation s 'improved. In 1974, Rose and Blank repeated one of Piaget's experiments but only asked the child whether, after pouring liquid from one glass into a differently shaped glass, there was the same quantity 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 save at a younger age. It is believed that when an adult repeats the question, the child believes the first answer was wrong.