A: A box with ten yellow cylinders which vary in height and diameter.
B: A box with ten red cylinders which vary in diameter.
C: A box with ten blue cylinders which vary in height.
D: A box with ten green cylinders which vary inversely in both height and diameter.
1. Bring the materials to the table.
2. Put the box in front of the child.
3. Open the box and take the cylinders out.
4. Choose the largest cylinder and put it on the left side of the table.
5. Choose the second largest cylinder and put it next right to the previous one.
6. Disassemble the cylinders and let the child do it. At this time, you leave and observe the child afar and come back when the child need help.
7. Put the cylinders back to the box in a sequence from biggest to smallest or vise versa.