Product design is a key aspect of human intelligence and creativity, attracting not only experts but also workers and self-employed without any formal design training. Although numerous people in developing countries design and manufacture simple products in metalworking microenterprises, there is very little systematic knowledge about their design process. This paper aims to fill this gap in design knowledge. We aim at investigating some aspects of design process in the metalworking microenterprises in Tanzania. The findings reveal how they identify needs, and generate and evaluate concepts.