A learning curve is a concept that shows graphically the relationship between the cost & output over a defined period of time, normally to represent the repetitive task of labor or worker. The learning curve was described in 1885 by psychologist Hermann Ebbinghaus & is used as a way to measure productivity efficiency & to forecast costs.
One of the most important issues in repetitive operations is the learning effect. It is obvious that a repetitive operation offers better opportunities to achieve high productivity. It is recognized that the productivity of labor improves when repetition is involved in an operation.