The most useful information I ever learned in school was theories of child development. I first read about Erikson, Piaget, and Kohlberg during my undergraduate studies and revisited those theorists throughout the rest of my education. I still continue to refer to this information and hope you find it interesting as well. There have been volumes written on and by each of these men. Most newer theories have stemmed, at least in part, from the information listed below.
This is just a very basic outline of what they have to say.

Erik Erikson's 8 Stages of Psychosocial Development

Stage Ages Basic Conflict Important Event Summary
1. Oral-Sensory Birth to 12 to 18 months Trust vs. Mistrust Feeding If the infant doesn't form a trusting, loving bond with the primary caregiver, a sense of mistrust develops.
2. Muscular-Anal 18 months to 3 years Autonomy vs.
Shame/Doubt
Toilet training The toddler's focus is on the developing fine and gross motor skills and bowel/bladder control (autonomy). The child learns control but may develop shame and doubt if the learning process is not completed in a positive, self affirming way.
3. Locomotor 3 to 6 years Initiative vs.
Guilt
Independence The child continues to become more of an independent individual and to take more initiative, but still needs to negotiate doing this appropriately.
If not permitted and encouraged to do so, this may lead to guilt feelings.
4. Latency 6 to 12 years Industry vs. Inferiority School The child must deal with demands of learning new skills (industry)or risk a sense of inferiority, failure and incompetence.
5.Adolescence 12 to 18 years Identity vs.
Role Confusion
Peer relationships The teenager must achieve a sense of identity in future occupation, gender/sex roles, politics, and religion or he will become confused and frustrated.
6. Young Adulthood 19 to 40 years Intimacy vs.
Isolation
Love relationships The young adult must develop intimate relationships or suffer feelings of isolation.
7. Middle Adulthood 40 to 65 years Generativity vs. Stagnation Parenting Parents must find some way to satisfy and support the next generation. Childless adults seek to make some type of impact on others or feel unimportant (stagnation)
8. Maturity 65 to death Ego Integrity vs. Despair Reflection on and acceptance of one's life The culmination is a sense of oneself as one is and of feeling fulfilled.

Piaget's Stages of Cognitive Development

Stage Ages Description
Sensorimotor 0 to 2 reflex Base
  • coorninate reflexes
  • Peroperational 2 to 6/7 self Oriented
  • egocentric
  • Concrete Operational 6/7 to 11/12
  • more than 1 point of view
  • no abstract problems
  • can consider some possible outcomes
  • Formal Operational 11/12 and up
  • Not everyone reaches this stage
  • think abstractly
  • reason theoretically


  • Lawrence Kohlberg's Six Moral Stages

    Level I: Preconventional


    Stage 1: Heteronomous Morality Content of Stage:

    What is right-

  • to avoid breaking rules backed by punishment
  • obedience for its own sake
  • avoiding physical damage to persons and property

    Reasons for doing right-
  • Avoidance of punishment
  • the superior power of authorities

    Social Perspective of Stage-
  • egocentric point of view
  • cannot consider the interests of others or recognize that they differ from the actors
  • cannot relate two points of view
  • actions are considered physical rather than in terms of psychological interests of others
  • confusion of authoritys perspective with one's own.
    Stage 2: Individualism, Instrumental Purpose, and Exchange Content of Stage:

    What is right-
  • follows rules when it is to one's immediate interest
  • acting to meet one;s own interests and needs and letting others do the same
  • right is also fair (an equal exchange,a deal, an agreement).

    Reasons for doing right-
  • to serve ones own needs or interests but also recognizes that other people have their own interests

    Social Perspective of Stage-
  • concrete individualistic perspective
  • aware that everybody has his own interest and these interests can conflict
  • understands "right" isrelative (in the concrete individualistic sense)
    Level II: Conventional

    Stage 3: Mutual Interpersonal Expectations, Relationships, and Interpersonal Conformity Content of Stage:

    What is right-
  • living up to what is expected by others or generally expect of people in your role (daughter, mother, teacher etc.)
  • being good is important, including having good motives, showing concern for others
  • keeping mutual relationships, such as trust, loyalty, respect, and gratitude

    Reasons for doing right-
  • the need to be a good person in one's own eyes others
  • caring for others
  • belief in the Golden Rule
  • desire to maintain rules and authority which support stereotypical good behavior

    Social Perspective of Stage-
  • perspective of the individual in relationships
  • awareness of shared feelings, agreements, expectations which are more important than individual interests
  • relates points of view through the concrete Golden Rule, putting oneself in the other persons's situation
  • cannot yet consider generalized system perspective
    Stage 4: Social System and Conscience Content of Stage:

    What is right-
  • fulfilling the actual duties which have been agreed
  • laws are upheld except in extreme cases where they conflict with other fixed social duties
  • right is also contributing to society, the group, or institution

    Reasons for doing right-
  • to keep the institution going as a whole
  • to avoid the breakdown in the system
  • the imperative of conscience to meet ones defined obligations

    Social Perspective of Stage-
  • differentiates societal point of view from interpersonal motives
  • takes the point of view of the system that defines roles and rules
  • considers individual relations in terms of place in the system
    Level III: Postconventional, or Principled

    Stage 5: Social Contract or Utility and Individual Rights Content of Stage:

    What is right-
  • awareness that people hold a variety of values and opinions, that most values and rules are relative to ones group
  • relative rules should usually be upheld, in the interest of impartiality and because they are the social contract
  • some nonrelative values and rights like life and liberty, must be upheld in any society

    Reasons for doing right-
  • a sense of obligation to law because of one's social contract to make and abide by laws for the welfare of all and the protection of the rights of all
  • contractual commitment, to family, friendship, trust, and work obligations
  • concern that laws and duties be based on the greatest good for the greatest number

    Social Perspective of Stage-
  • prior-to-society perspective
  • perspective of a rational individual aware of values and rights prior to social attachments and contracts
  • integration of perspectives by formal agreement, contract, objective impartiality, and due process
  • considers moral and legal points of view, recognizes that they sometimes conflict and finds integration difficult
    Stage 6: Universal Ethical Principles Content of Stage:

    What is right
  • follows self-chosen ethical principles
  • particular laws or social agreements are usually valid because they rest on principles
  • yhen laws violate principles, one acts in accordance with the principle
  • principles are universal principles of justice, human rights and the dignity of human beings as individuals.

    Reasons for doing right-
  • the belief in the validity of universal moral principles and a sense of personal commitment to them

    Social Perspective of Stage-
  • perspective of a moral point of view from which social arrangements derive
  • perspective is recognizing the nature of morality or the fact that persons are ends in themselves and must be treated as such

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