Abstract
Learning process of manual assembly task is ever becoming a serious problem under the situation where a small lot size, various types of products and short product life is prevailing. The simple manipulative task of “pick and place” has been performed with instructions available through a computer. The method of measuring the amount of memorized information throughout the learning process can be applied to analyze the operator's learning ability. The experimental formula which represents the memorization process can be used to evaluate the learning effect of a manual assembly task.