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experience curve effects
In management, models of the learning curve effect and the closely related experience curve effect express the relationship between equations for experience and efficiency or between efficiency gains and investment in the effort.
== Learning curve and learning curve effect ==
(詳細はHermann Ebbinghaus investigating the difficulty of memorizing varying numbers of verbal stimuli. Subsequent learning about the complex processes of learning are discussed in the Learning curve article.
Experience shows that the more times a task has been performed, the less time is required on each subsequent iteration. This relationship was probably first quantified in 1936 at Wright-Patterson Air Force Base in the United States,〔Wright, T.P., Factors Affecting the Cost of Airplanes, ''Journal of Aeronautical Sciences'', 3(4) (1936): 122-128.〕 where it was determined that every time total aircraft production doubled, the required labour time decreased by 10 to 15 percent. Subsequent empirical studies from other industries have yielded different values ranging from only a couple of percent up to 30%, but in most cases it is a constant percentage: It did not vary at different scales of operation. The Learning Curve model posits that for each doubling of the total quantity of items produced, costs decrease by a fixed proportion, as described by Equations 1 and 2. The equations have the same equation form. The two equations differ only in the definition of the ''Y'' term, but this difference can make a significant difference in the outcome of an estimate.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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