Theorist's unique contribution to the topic of Educational Psychology

From Yount chapters 3–5, choose one theorist to discuss (Erikson, Piaget, Vigotsky, or Kohlberg.) Discuss this theorist's unique contribution to the topic of Educational Psychology and the Learner. Finally, using Yount's "Discipler's Model" discuss what aspects of their research and writing that work well within a biblical worldview and which aspects may be problematic.