

Conservation
The ability to pass conservation tasks provides clear evidence.
(Berk, 2013, p.234-236).
Classification
Between ages of 7 and 10, children pass Piaget’s class inclusion problem. This indicates that they are more aware of classification hierarchies and can focus on relations between a general category and two specific categories at the same time, thus collections become common in middle childhood.
(Berk, 2013, p.234-236).
Seriation
The ability to order items along a quantitative dimension such as length or weight.
Transitive inference: Is the ability to do so mentallyIs the ability to do so mentally
(Berk, 2013, p.234-236).
Piaget:
Concrete Operational
Reversibility
The capacity to think through a series of steps and then mentally reverse direction, returning to the starting point.
(Berk, 2013, p.234-236).
Spatial Reasoning
School-age children’s understanding of space is more accurate than that of preschools. They can use landmarks, and have the notion of scale.
(Berk, 2013, p.234-236).
Limitations
Children cannot grasp abstract ideas well and it applies only to information children can perceive and observe directly.
(Berk, 2013, p.234-236).
Middle Childhood



