Erikson's stages of psychosocial development, as articulated by Erik Erikson, explain eight stages through which a healthily developing human should pass from infancy to late adulthood. In each stage, the person confronts, and hopefully masters, new challenges. Each stage builds upon the successful completion of earlier stages. The challenges of stages not successfully completed may be expected to reappear as problems in the future.

However, mastery of a stage is not required to advance to the next stage. Erikson's stage theory characterizes an individual advancing through the eight life stages as a function of negotiating his or her biological forces and sociocultural forces. Each stage is characterized by a psychosocial crisis of these two conflicting forces (as shown in the table below). If an individual does indeed successfully reconcile these forces (favoring the first mentioned attribute in the crisis), he or she emerges from the stage with the corresponding virtue. For example, if an infant enters into the toddler stage (autonomy vs. shame & doubt) with more trust than mistrust, he or she carries the virtue of hope into the remaining life stages.[1]

The first stage of Erik Erikson's theory centers around the infant's basic needs being met by the parents and this interaction leading to trust or mistrust. Trust as defined by Erikson is "an essential truthfulness of others as well as a fundamental sense of one's own trustworthiness."[4] The infant depends on the parents, especially the mother, for sustenance and comfort. The child's relative understanding of world and society come from the parents and their interaction with the child. If the parents expose the child to warmth, regularity, and dependable affection, the infant's view of the world will be one of trust. Should the parents fail to provide a secure environment and to meet the child's basic needs; a sense of mistrust will result.[5] Development of mistrust can lead to feelings of frustration, suspicion, withdrawal, and a lack of confidence.[4]

According to Erik Erikson, the major developmental task in infancy is to learn whether or not other people, especially primary caregivers, regularly satisfy basic needs. If caregivers are consistent sources of food, comfort, and affection, an infant learns trust- that others are dependable and reliable. If they are neglectful, or perhaps even abusive, the infant instead learns mistrust- that the world is in an undependable, unpredictable, and possibly a dangerous place. While negative, having some experience with mistrust allows the infant to gain an understanding of what constitutes dangerous situations later in life.[5]

Will: Autonomy vs. Shame & Doubt (Muscular-Anal, 2-4 years)[edit]
Existential Question: Is It OK to Be Me?
As the child gains control over eliminative functions and motor abilities,then they begin to explore their surroundings. The parents still provide a strong base of a security from which the child can venture out to assert their will. The parents' patience and encouragement helps foster autonomy in the child. Children at this age like to explore the world around them and they are constantly learning about their environment. Caution must be taken at this age while children may explore things that are dangerous to their health and safety.

At this age children develop their first interests. For example, a child who enjoys music may like to play with the radio. Children who enjoy the outdoors may be interested in animals and plants. Highly restrictive parents, however, are more likely to instill in the child a sense of doubt, and reluctance to attempt new challenges. As they gain increased muscular coordination and mobility, toddlers become capable of satisfying some of their own needs. They begin to feed themselves, wash and dress themselves, and use the bathroom.

If caregivers encourage self-sufficient behavior, toddlers develop a sense of autonomy—a sense of being able to handle