Readings:
Excerpts from chapters 3, 4, 5 of "The Psychology of the Child" by Jean Piaget and Barbel Inhelder, Basic Books (Harper-Collins), 1969. Please read and focus on these sections in your summary.
More background from Piaget and Inhelder (you don't have to read this).
Ana Ramirez's Notes on Piaget
JFC's comments for this lecture