Examlex
In Wallerstein's world systems theory, what are the four categories of nations?
Object Permanence
The understanding that objects continue to exist even when they cannot be seen, heard, or otherwise sensed.
A Barrier
An object or circumstance that impedes progress or achievement, often serving to block passage or access to something or someone.
Formal Operations
The final stage in Piaget's theory of cognitive development, characterized by the ability to think abstractly and logically.
Cognitive Development
The process by which an individual's ability to think, reason, and solve problems evolves over the course of their life, particularly during childhood.
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