Using Visualizations to Learn Algorithms: Should Students Construct Their Own, or View an Expert's?

Algorithm visualization software graphically illustrates how computer algorithms work. Past experiments designed to substantiate the software’s pedagogical value have yielded mixed results. A review of these studies suggests that the more actively involved learners are in the visualization process, the better they perform. Given this trend, and inspired by ethnographic fieldwork we conducted in an undergraduate algorithms course, we hypothesize that students who use simple art supplies to construct their own visualizations will learn an algorithm better than students who interact with computer-based visualizations constructed by an expert. We conducted an experiment to test this hypothesis, and found no significant differences between the two pedagogical approaches. Thus, students who use “low tech” materials to construct their own visualizations may learn algorithms just as well as students who study conventional “high tech” visualizations constructed by an expert. This result motivates a markedly different kind of algorithm visualization software: one that enables learners to construct their own “low tech” visualizations.