During an aerobics class, the instructor introduces the clas…

During an aerobics class, the instructor introduces the class to a new routine. He has everyone perform one step of the routine multiple times and asks, “Has everyone got it?” The students yell, “Yeah!” The instructor responds, “Adding on!” and shows the class another step. Once they have learned that step, the instructor has the class perform the first step, followed by the second step, and “adds on” again. The instructor repeats this process until the class is performing a long, complex routine at the end of the hour. The instructor’s procedure exemplifies