Abstract
In this paper we develop theories of product architecture formation. Conventionally, when a new technology is implemented in a product with modular architecture, the modular architecture is transformed into integral architecture. However, since there is little research for product architecture formation of automobile engine components, we discuss whether existing theories of product architecture explain complex products such as automobile engines. At first glance, existing theories are not adaptable to engine components, but they are adaptable when concept hierarchy is considered. It is difficult to understand the appropriate product architecture. This study supports the importance of the concept of hierarchy in product architecture.
