User integration is a key aspect of new product development. When applying corresponding methods, however, there is a communication gap that needs to be overcome by the designer. Prototyping is a means to bridge this disjunction, yet brings its own set of hermeneutic limitations. Taking a closer look at the processual information exchange, we propose the concept of the user-driven minimum feasible product (UD-MFP). It describes the artefact generated by the users themselves in their specific context, which contains the essence of the problem's solution as a possible source of validation.