Piaget observed children in a long period of time to come to a conclusion that children learn through play. Piaget was interested in how children learn and how they think. Piaget observed his 3 children and observed them using 3 different methods which were; he made observations on the children which these were full of detail, the second method he used was interviews with older children who could have conversations and ask questions to other people. Piaget also wrote diary descriptions from the observations he carried out. He believed that children think a lot differently compared to adults. Piaget believed that children go through 4 stages which children can’t miss any stage to continue to develop cognitively. Every individual child has to