One challenge today for companies lies in finding the right approach to measuring and continuously improving the current state of a company’s product development process. The task of continuously improving the performance demands the successful management of information, communication, cooperation and decision-making in a context of uncertainty, which is a highly complex task in itself. To be able to manage a complex product development system in an appropriate way, the authors have identified three important interdependent aspects of product development. The aspects are decision-making, uncertainty and performance. These aspects form the foundation for the suggested model which is intended to be used by engineering design researchers.