Piaget created a cognitive developmental theory which explains four broad stages. The first stage is sensorimotor. This stage describes how babies use their senses to become aware of their environment. For example, babies putting objects in their mouth is an example of how they use their senses. The next stage is preoperational which is language. At this stage children begin to learn for example their name. Concrete operational is going further than language and beginning to apply it. According to “Cognitive Development Theory” by the stage formal operations “The person no longer requires concrete objects to make rational judgements. He or she is capable of deductive and hypothetical reasoning.” (2016) All three theories have several similarities