The formal operational stage begins in early adolescence. In childhood, logical operations are concrete ones, limited to objects that can be visualized, touched, or directly experienced. The advance of the early adolescent into formal operational thinking involves the capacity to deal with possibilities that are purely speculative. This permits coping with new classes of problems: those involving relationships that are purely abstract or hypothetical or that involve the higher-level analysis of a problem by the systematic consideration of every logical (sometimes fanciful) possibility. The logical adequacy of an argument can be examined apart from the truth or falsity of its conclusions.
Concepts such as "forces," "infinity," or 'justice," nowhere directly experienced, can now be comprehended. Formal operational thought permits the midadolescent or adult to hold abstract ideals and to initiate scientific investigations.
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