While academics and practitioners are increasingly aware of the value of including the customer in new product development (NPD), processes for doing so effectively remain unclear. Therefore, this study explores the process through which a firm's interaction orientation (the ability to effectively interact with customers) influences product development performance. Drawing on the resource‐based view, this study develops a research model in which two market‐relating capabilities—market‐linking and marketing capabilities—mediate the effect of interaction orientation on product development performance. The validity of this model is examined by analyzing primary data gathered from 167 Taiwanese electronics companies. The model results provide support for a process link between interaction orientation, market‐relating capabilities, and product development performance, such that a firm's capabilities enable the conversion of customer‐based resources into productive new product outcomes. More specifically, the interaction orientation–product development speed relationship is mediated by both marketing and market‐linking capabilities, while the interaction orientation–product innovativeness relationship is partially mediated by marketing capability. That is, interaction orientation has indirect effects on product innovativeness and product development speed by strengthening both marketing and market‐linking capabilities that in turn improve product development performance. In addition, the results suggest that a firm's interactive rationality moderates the relationship between interaction orientation and marketing capability. Overall, this study enhances our understanding of how firms achieve superior product development performance by developing effective customer interaction. The findings of this study provide important strategic insights into NPD.