1. Jean Piaget’s Stages of Development
Jean Piaget was a developmental psychologist best
known for his theory of cognitive development.
Piaget's stages deal with the nature of knowledge
(epistemology) and how humans come to
gradually acquire it.

2. Jean Piaget Piaget's theory of cognitive development is a
comprehensive theory about the nature and development
of human intelligence, first developed by Jean Piaget.
It is primarily known as a developmental stage theory,
but in fact, it deals with the nature of knowledge
itself and how humans come gradually to acquire,
construct, and use it. To Piaget, cognitive development
was a progressive reorganization of mental processes as
a result of biological maturation and environmental
experience. Children construct an understanding of the
world around them, then experience discrepancies between
what they already know and what they discover in their
environment.

3. Jean Piaget’s Stages of Development

4. Simply put…

5. Developmental Theory Clip (4min)

6. Erik Erickson
Erik Erikson (15 June 1902 – 12 May 1994) was a German-born American developmental psychologist and psychoanalyst known for his theory on psychosocial development of human beings. He may be most famous for coining the phrase identity crisis.

7. Erickson’s Theory of Human Development
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8. Erickson’s Stages of Development