Examlex
Transportation problems are a special type of distribution-network problem
Preoperational Thought
A stage in Piaget's theory of cognitive development where children from about 2 to 7 years of age are able to use symbols and language but do not yet understand concrete logic.
Conservation
The careful preservation and protection of something, especially aimed at preventing the depletion of natural resources.
Private Speech
The internal dialogue that occurs when people talk to themselves (either silently or out loud).
Vygotsky
A psychologist known for his theory of social development and concepts such as the Zone of Proximal Development and scaffolding in learning.
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