In conceptualizing cognitive development, what is meant by "relational" and "complexity" in Halford's relational complexity theory?

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The Answer is Relational complexity theory views cognitive development as the result of the differentiation of working memory that facilitates the capacity to deal with tasks of increasing complexity. Task complexity is based not on the amount of information being processed but rather on complexity of relations that exist among pieces of information.

In Conceptualizing Cognitive Development, What Is Meant by "Relational" and "Complexity