learning curve　

learning curve　学习曲线　

Learning curves graphically portray the costs and benefits of experience when performing routine or repetitive tasks.Also known as experience curves，cost curves，efficiency curves，and productivity curves，they illustrate how the cost per unit of output decreases over time as the result of accumulated workforce learning and experience.That is，as cumulative output increases，learning and experience cause the cost per unit to decrease.Experience and learning curves are used by businesses in production planning，cost forecasting，and setting delivery schedules，among other applications.