A precious little girl, fascinating answers, and thirty minutes well spent help make a Piaget project successful. My time spent interviewing a child for cognitive development was eye-opening and gave me a first-hand look at how a child's mind matures with age. NG, 4 years, 11 months, embodied everything I could ask for in a child to conduct such an interview investigation on. As he approaches his fifth birthday next week, his age is somewhere between three and seven, providing me with information that is certainly conducive to our study. Moments into our interview it was evident that my son had fallen into Piaget's preoperational stage of cognitive development. More specifically, NG fell into the second half of the pre-operational phase. What initially clued me in was his first response to my conducting the proof of length conservation. After laying out two identical straws, his reasoning for why one straw was longer than the other was: "it's not all the way to the bottom of the other one." This is a perfect example of an intuitive hypothesis, even though it shows a lack of logic in the statement. A crucial factor of the preoperational stage of development is that children cannot yet manipulate and transform information in logical ways, which has been clearly seen through the demonstration of conservation of numbers. Although NG was able to correctly identify that each row still contained an equal number of pennies after being dealt, she was required to count the number of pennies in each row. In the preoperational stage of development, children do not yet understand logical mental operations such as the mental mathematics presented in the proof. Another essential element that leads me to firmly support the involvement of NG in the pre-operational phase... halfway through the document... a few years before reaching the concrete operational phase of development, which is triggered at the age of seven and beyond when a child's thinking is no longer dominated by appearance. Furthermore, as part of the concrete operational phase, logic, reasoning and the ability to classify objects into classes, as well as conservation, are present. From the first part it was evident that NG did not possess preservation, which leads me to confirm that she should be classified as a preoperative child. During this "interview" came a new understanding of a child's cognitive development, and their reasoning which was a big surprise. The answers that were presented and the reasons why things were the way they were honestly amazed me. Mental abilities mature with age and I now understand how brilliant Piaget was in classifying such behaviors.