Luna del Alba Anillo Pérez

Transdisciplinarity and the co-production of knowledge have become fundamental approaches to addressing complex social problems. However, the sustainability of collaborative partnerships remains underexplored from an empirical perspective. This article examines the mechanisms that shape the continuity of collaborative networks in social innovation projects in the field of social services, particularly those linked to community-based welfare systems in Andalusia (Spain). Drawing on a thematic qualitative analysis of 15 social innovation projects and 14 semi-structured interviews with project coordinators, the study explores how diverse actors (universities, public administrations, third-sector organisations, and citizens) mobilise different types of social capital within local social services. The findings reveal that collaboration success depends on a balance between relational enablers (trust and shared experiences) and structural barriers (bureaucracy, work overload, and lack of time). The analysis also shows that participatory methodologies and connections with pre-existing networks are essential for sustaining collaboration after project completion. The article concludes that the sustainability of transdisciplinary social innovation in social services requires moving beyond project management logics and investing in the care of invisible relational structures, with implications for public policies aimed at consolidating trust ecosystems and long-term collective learning.