A learning curve graphically represents the amount of experience it takes to learn a given task. Skills with a steep learning curve are difficult to learn quickly, but progress comes rapidly once past the initial hurdle. Activities with a shallow learning curve, by contrast, are said to be ‘easy to learn, hard to master’ (Bushnell’s Law of video game design).
The term can refer to individual tasks repeated in a series of trials or a body of knowledge is learned over time. It was first described by German psychologist Hermann Ebbinghaus in 1885. His tests involved memorizing series of nonsense syllables, and recording the success over a number of trials. The translation does not use the term learning curve—but he presents diagrams of learning against trial number. He also notes that the score can decrease, or even oscillate.
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The Daily Omnivore 