In the second half of inter–organizational product development, the new product is likely to face significant design changes. Our study focused on the adequacy of the analytic hierarchy process (AHP) to support the collaborative partners to steer and align the accompanying design activities. It quantitatively supported discussions between researchers, engineers, manufacturers and future users involved in the development of a voice–producing prosthesis. These discussions focused on the planning of respectively the product design objectives, design changes, and design activities. This product design planning was based on the product requirements relevant to the diverse groups involved, a pro–active view on the market circumstances, the available knowledge, skills and resources, lead–time and costs. The outcomes showed that the AHP is an adequate tool for R&D managers to support inter–organizational product development.