Kelly and her friends have become very good at figuring out the world around them.For example, one day, Kelly went to school like normal.You can test out of the first two years of college and save thousands off your degree.

They had three variables: the weight, the length of string and how hard they pushed the pendulum.

By manipulating the variables, they had to figure out which one affected the speed of the swing the most.

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But she had also changed her hair, so maybe that's why he said hi.

Or perhaps it was the fact that she smiled at him as he walked down the hall.Piaget found that younger children would randomly change variables without thinking things through, while adolescents capable of formal operations would systematically change one variable at a time to see how it affected the swing speed of the pendulum, much in the same way that Kelly and her friends are experimenting with what captures Jordan's attention.Adolescence is the period of life between childhood and adulthood.They are being systematic in the way they are trying it, by isolating one variable at a time, like Kelly's hair or her smile.Piaget noticed that adolescents in the formal operational period become systematic in the way that they approach scientific experimentation. He gave kids a set of weights and a piece of string and asked them to make a pendulum that would swing the fastest.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.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.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.

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