Identity development depends on the degree of exploration and commitment to an identity see Marcia, For example, the lens of the eye starts to stiffen and thicken, resulting in changes in vision usually affecting the ability to focus on close objects. They discover the relationship between decisions and consequences and develop self esteem and self confidence. Lisa Roundy Lisa has taught at all levels from kindergarten to college and has a master's degree in human relations.
Human development is a predictable process that moves through the stages of infancy , childhood , adolescence , and adulthood. The developmental psychology of Jean Piaget. School districts need to support programs that interrupt negative peer interactions, particularly bullying, that impedes the healthy development of youth.