Model for Redesigning User-Centric Sustainable Products

This article introduces a comprehensive model that integrates TRIZ (Theory of Inventive Problem Solving) and Design Thinking to design or redesign user-centered sustainable products. The proposed methodology aims to support small and medium-sized enterprises (SMEs) by offering an accessible and practical approach that balances technical and commercial feasibility while addressing consumer needs. The model underwent implementation in the conceptual redesign of a bento-style lunch box, yielding significant improvements over the original design—particularly in volume reduction, ease of transport, and lower environmental impact. The fusion of the technical (TRIZ) and social (Design Thinking) approaches proved effective, enabling the resolution of specific technical challenges while simultaneously aligning the solution with user expectations and requirements. This model holds substantial potential to streamline the development of new products or enhance existing ones within SMEs. Future research may validate the model across various industrial contexts and assess its long-term economic and environmental impact.