Principle of simple to Complex
Skills related to mental or intellectual abilities and skills related to verbal comprehension are used by the child to solve the problem.
for example, if the child must learn to classify the object so kite and airplane may be the same for her because they both fly in the sky.
This type of response is associated with the first level of thinking and based on thoughts existing between the two.
But in the later stage of learning, they will be able to understand more Complex similarities and differences between these objects.
For example, they will try to understand that kites and airplanes do belong to different categories.