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FORMAL OPERATIONAL
AT THIS AGE THE CHILD CAN USE HYPOTHETICO-DEDUCTIVE REASONING, NOT ONLY THINKING IN AN ABSTRACT WAY, BUT ALSO MORE SCIENTIFIC, OR LOGICAL. WHEN ASKED ABOUT THE FEATHER BREAKING A GLASS SHE IS ABLE TO USE DIALECTICAL ANALYSIS TO PROBE IDEAS, AND THEIR LIMITATIONS. IT DOES NOT MATTER WHAT THE FINAL CONCLUSION IS, AS LONG AS GOOD DIALECTICAL ANALYSIS IS SHOWN.

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CONCRETE OPERATIONAL
AT THIS AGE THEY ARE NOT GOING TO FALL FOR THE DIFFERENT GLASS, DIFFERENT AMOUNT SCHEME AGAIN. WHEN ASKED IF HITTING A HAMMER WITH A GLASS WOULD BREAK THE GLASS? OF COURSE THE CHILD SAYS YES, A HAMMER IS HARDER THAN A GLASS. WHEN ASKED ABOUT A FEATHER THEY OF COURSE SAY NO A FEATHER IS TOO LIGHT. JUST CAN NOT FOOL THESE KIDS, OR CAN WE??

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PRE-OPERATIONAL
WHEN PRESENTED WITH 2 SMALL GLASSES OF JUICE AND ASKED WHICH IS BIGGER, OR ARE THEY THE SAME? THE CHILD CAN DEFINITELY SEE THEY ARE THE SAME, BUT ONCE ONE OF THE GLASSES OF JUICE IS POURED INTO A TALLER GLASS THE CHILD AUTOMATICALLY BELIEVES THERE IS MORE JUICE IN THE TALLER GLASS JUST BECAUSE IT IS BIGGER; EVEN THOUGH THEY SAID THEY WERE EVEN 1 MINUTE PRIOR. THEY DO NOT RECALL THAT INFORMATION. THEY ONLY SEE A BIGGER OBJECT NEXT TO A SMALLER OBJECT.

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SENSORIMOTOR
THE CHILD WILL SEE YOU MOVE AN OBJECT, BUT INSTEAD OF LOOKING WHERE THE OBJECT WAS MOVED TO, THEY LOOK IN THE LAST PLACE THEY FOUND IT.