Marini,of Brock University,and Case,of the University of Toronto,tested adolescents on two types of abstract reasoning problems.They found that two-thirds of the adolescents performed at the same reasoning level on the two tasks,while the other one-third performed at a more advanced level on one task.This finding:

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The finding that one-third of the adolescents performed at a more advanced level on one task indicates that the application of formal thought is not always uniform across tasks. This goes against Piaget's theory that cognitive development occurs in a uniform sequence of stages, with each stage building upon the previous one. Instead, the finding suggests that cognitive development can be task-specific and may not always follow a predictable sequence.

Marini,of Brock University,and Case,of the University of Toronto,tested Adolescents on Two