Abstract
The diversification of consumer's needs and the shortening of product's lifecycle increase uncertainty about production volume and period. Manufacturing systems are now required to realize competitive and optimized ones which can be following a fluctuation of demand in the market. Therefore, we propose a methodology for designing manufacturing systems with adaptability for market trends. This methodology consists of two methods; namely, "manufacturing system modularization" and "implementation of improvement". In this paper, the usefulness of this methodology is verified by computer simulation.