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To better describe and elaborate the proposed framework, we examine the TTP from each of the four levels described in Figure 2 .
First, we provide each of our students with a worksheet that models a specific instance of the ''Two Towers'' scenario (e.g., with PQ = 4 cm and QS= 12 cm). Next, we ask our students to draw a point R anywhere along segment QS then estimate total rope length (i.e. PR+RT) using a centimeter ruler. We show a sample worksheet, annotated with student work, in Figure 3.


Antonio Quesada and Michael Todd Edwards, "A Framework for Technology-Rich Explorations - Illustration of the Framework 1," Loci (July 2005)
Journal of Online Mathematics and its Applications