Believed that children thought in different ways than adults (Gordon & Browne, 2014). He developed four stages of cognitive development (Gordon & Browne, 2014). Each phase is associated with a key concept (Gordon & Browne, 2014). All stages, except the last, occur during the early childhood years (Gordon & Browne, 2014). The first stage is sensorimotor which is based on object permanence (Gordon & Browne, 2014). This stage occurs from birth to 2 years of age (Gordon & Browne, 2014). During this stage the child learns about the physical world and acquires the awareness that when an object disappears, it still exists (Gordon & Browne, 2014). The second phase is pre-operational and is based on symbolic play and language (Gordon & Browne, 2014). Children aged 2 to 6 or 7 years old are in this developmental stage (Gordon & Browne, 2014). During this stage children develop the ability and ability to think (Gordon & Browne, 2014). This is when imaginative play develops (Gordon & Browne, 2014). The third stage during early childhood is concrete operational and occurs between ages 6 and 12 (Gordon & Browne, 2014). The basic concept at this stage is reasoning during which children develop the ability to think logically (Gordon & Browne, 2014). This stage helps children perform actions mentally (Gordon & Browne,