The theories of V and P have some significant similarities as well as important difference.
Both were interested in development, but whereas P believed that development must precede learning
V belived that development and learning influence each other.
P claimed that a person must be in a particular developmental stage to grasp certain concepts.
V, on the other hand, argued that when children learn a specific skill,
they also perceive the principles that underlie the new skill
For example, as children learn to write their names,
they begin to associate the sounds that make up the name with the letters in the name.
Cognitive development Progress as children learn