As I read the three theories I discovered the following main points that were most convincing about their theories. Jean Piaget developed the theory of cognitive development which includes four phases: the sensorimotor phase in infancy, the preoperational phase which manifests itself during childhood and early childhood, the concrete phase during elementary school and part of adolescence and the operational state formal. from adolescence to adulthood (Huitt & Hummel, 2003). Lev Semenovich Vygostky developed the theory of social development. The zones of proximal development are between the child's ability to solve problems alone and the ability to solve problems with an assistant (Shultz, 2014). Erik Erickson states that we develop through the predetermined development of personalities in eight stages (Boeree, 2006). As I read all the theorists I became more interested in how each theory manifests itself in children. I decided to try Piaget's theory with my 20 month old nephew. I gave him some play dough and asked him to play with it. He touched it and cut it into pieces. When I started to roll him out and make little balls of clay, he tried to do the same thing. He took my balls from my hands and started playing with them, smashing them and doing other things. By building and creating different shapes he shifted the concept of conservation as he played. In implementing Vykostky's theory I told my nine-year-old daughter to walk on a balance beam at the park. At first she tried to do it on her own but after six or seven times she got frustrated. I therefore decide to divide the task into small steps. First I held her hand and helped her walk across the beam while holding my hand. Then, as she felt more comfortable… middle of paper… ideas and how each of them will impact our class not just as an individual member of our room. Everyone had the opportunity to contribute and express their thoughts without mockery. By doing this activity the students mastered the activity without conflict and/or criticism. According to T. Tamara “Teachers who apply psychosocial development in classrooms create an environment where every child feels valued and feels comfortable learning new things and building relationships with peers without fear” (Tamara, 2010) . All three theorists have something interesting and facts related to the stages of development. I can only conclude that each of them can help teachers like me increase awareness of student development and maturity. This gives us the opportunity to increase student learning and help them develop and grow healthily.