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I did such an experiment to my 2,5 year old cousin. I asked for his mother to bring 2 tea glasses with full of water and 2 water glasses one of which was wide and short and one of which was narrow and tall. Next, I asked my cousin if the water amount is the same in both tea glasses. She said "Yes". Then I said "now watch carefully" and slowly poured one of the tea glasses into the wide&short glass and poured the other one into the narrow&tall one. In narrow&tall glass, the level of water seems above from the wide&short one despite the fact that the amount of water is the same in both glasses. Then I asked if water amount of the glasses is the same. And she answered "No, there is much more water in the narrow&tall water (She was pointing to level of water in narrow&tall glass with her finger while telling it)" Then I asked for 6 biscuits from her mother and separated them into 2 groups each of which contain 3 biscuits. Then asked if they are the same and she said "Yes". After that, I took one of the group which contains 3 biscuits and divided each biscuits so that numerically they looks like there are 6 biscuits with half length. Now I had 2 groups one of which had 3 standard biscuits and the other one contained 6 biscuits pieces with half length of standard biscuits. Afterwards I asked her again if the amount of the biscuits are the same in each group and she says "No". When I ask "why" she said, " This one is much because it has more biscuits(by pointing out the group containing 6 biscuits pieces)" It was nice to see such an experiment. It means that children at a specific developmental stage process their observations in line with their own perceptions, not the ones adults have and as such it supports the idea that children build their own knowledge by making interpretations on what they see, on what they interact with the world.

We can see a brief overview of these stages which used examples for each levels..

It is really weird to watch the reasonings and answers although we read that they are so. I was surprised once again.

Yes hatice, actually I can go on applying the theory to my cousin by hiding it from Yengem, it is unethical I know:). May be I should wait until I have my own children. I can give permission myself to apply Piaget's theory to my children, no problem:), I agree saime, in one ofthe video a little girl was shown a simple triangle and was asked to draw exactly what she saw, and she drew a different sketch and showed the corners of her triangle that was completely in different places. It was in the video that Evrim Hoca posted to Diigo, I guess.

You can find the famous basis of Piaget's developmental stages via demonstrations.

They summarized the main ideas briefly.Thats nice. Also the backgound music is really complementary :)