6

Developing expertise

Stage models of expertise

There is a mathematical model of learning and expertise development that appears to cover a range of measures and a wide range of domains. This is the Power Law of Practice (Newell & Rosenbloom, 1981). Newell and Rosenbloom referenced a number of studies (mirror tracing, cigar manufacturing, learning to read inverted texts, scanning for targets in a display and so on), all of which showed the same learning pattern that could be displayed as a version of the one in Figure 6.1 which gives an abstract version of the graphs based on the law. In the graph on the left, as practice continues (x-axis), measures such as the number of errors or reaction times (RTs) drop but the rate at which this happens ...

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