This is an era that everyone is designing. Design is transforming from only focusing on professional fields like interiors, architecture, products, and clothing to focusing on the design of society, service, system, and strategy. The design's definition and boundaries are changing. The ARNOLD project hosted by the Politecnico di Milano School of Design explores in depth the methodologies involved in the design of social innovation, especially in exploring the potential of co-creation design in social innovation design. The design teams with different backgrounds and various stakeholders collaborated under a common vision, realizing the intersection and integration of service design, urban space design, and interior design. To conclude an ef...