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. 2010 Mar 24;107(15):7018–7023. doi: 10.1073/pnas.1000942107

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Fig. 1. — Sequences of tutor interaction during a problem isomorph. (A) The student starts out in a state with a data-flow equivalent of the equation x – 10 = 17. The student uses the mouse to select this equation and chooses the operation “Invert” from the menu. (B) A keypad comes up into which the student enters the result 17 + 10. (C) The transformation is complete. (D) The previous state (data-flow equivalent of x = 17 + 10) is repeated and the student selects 17 + 10 and chooses the operation “Evaluate”. (E) A keypad comes up into which the student will type “27.” (F) The evaluation is complete.