When developing products and services to improve the well-being of the multidimensional poor, designers need deep contextual insight. However, literature does not specify which topics to discuss or which questions to ask. We used Sen’s capability approach to develop question categories and specific questions, and we selected tools to support them. This resulted in an Opportunity Detection Kit, which has been tested to evaluate the impact of the Philips Chulha in rural South-India. The kit stimulated the participants to think deeply about the impact of the Chulha and encouraged them to share their stories. In this way, new areas for improvement were detected. Thereby, a holistic and comprehensive picture could be drawn about participants’ lives, which indicated opportunities for new product development. The integration of the capability approach and design for development therefore seems promising for the evaluation of product impact and opening up new design perspectives.