A graphic headed zone of proximal development. The sweet spot. Three concentric circles. The out circle is yellow and says just can't do yet and the corresponding text box below the circles says things the student just can't do yet. The middle circle is green and says the zone of proximal development. The corresponding text box below says things the student can do with a bit of help, such as working with peers in their class to solve difficult mathematics problems together. The inner circle is blue and says can do alone. The corresponding text box says things the student can do all on their own.