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Kelly and her friends have become very good at figuring out the world around them.
That is the hallmark of the formal operational period of development, according to Piaget.
Though mental manipulations are the hallmark of formal operations, they aren't the only way that thinking changes in adolescence.
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Let's look closer at what formal operations are, how they develop in adolescence and what they have to do with scientific experimentation. Well, not too long ago, her father read Kelly this problem: 'Jonah is taller than Mia and shorter than Gene. ' A few years ago, Kelly wouldn't have been able to figure out the answer to that problem without drawing Jonah, Mia and Gene on a piece of paper.
But now that she's able to perform formal operations, Kelly doesn't have to draw the characters on paper.
She puzzles over it and then gives him her answer at breakfast.
Kelly is in adolescence, or the time between childhood and adulthood. They grow taller and start to look more and more like adults.
But on this day, something happened: Jordan, the boy she has a crush on, said hi to her in the hallway!
He'd never done that before, and Kelly was so excited that he finally noticed her! She was wearing a new outfit, so maybe that was it.