The extended quality function deployment in product life cycle design

This paper describes the extended quality function deployment (QFD) in life cycle design (LCD) based on the traditional QFD which is often used at the requirement analysis stage. By investigating QFD in the product life cycle design, the extended QFD is proposed with the theoretical frame. The extension begins with the analysis of requirement by adding environment and cost factors, instead of only customer requirements, as the input of the 1st level house of quality (HoQ). Accordingly, multi-target values are built in. In a sequential process of the LCD, the extension carries out requirement deployment, function deployment, equipment deployment, pan deployment, cost deployment and reliability deployment. Finally, this paper reveals how to apply the extended QFD in LCD and how to choose and adjust HoQ for different products.