A simulator alone is not a complete teaching system; it needs to be augmented with an instructor (or, better yet, many instructors). Just as a flight instructor might interrupt a simulated flight to remind the student of some important principle or to share a real-life experience, GuSS programs contain some teaching modules that monitor the simulation and interrupt with stories, commentary, and other guidance in the course of the student's activity. The GuSS system illustrates how powerful a simulation can be when it is coupled with knowledgeable teachers who can monitor the simulation.
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