RT Journal Article T1 Beyond the Project Cycle: Relational Sustainability in Transdisciplinary Social Innovation in Social Services A1 Anillo Pérez, Luna del Alba A1 Ferri Fuentevilla, Elena A1 Fernández Borrero, Manuela Ángela A1 Martí García, Susana K1 Transdisciplinarity K1 Sustainability K1 Knowledge co-production K1 Social innovation K1 Social services K1 Community social services AB 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. PB MDPI YR 2026 FD 2026 LK https://hdl.handle.net/10272/28166 UL https://hdl.handle.net/10272/28166 LA eng NO Anillo Pérez, L. d. A., Ferri Fuentevilla, M. E., Fernández-Borrero, M. Á., & Martí García, S. (2026). Beyond the Project Cycle: Relational Sustainability in Transdisciplinary Social Innovation in Social Services. Social Sciences, 15(2), 74. https://doi.org/10.3390/socsci15020074 NO This research was funded by Consejería de Inclusión Social, Juventud, Familias e Igualdad, grant number (SSCC)542-2024-00000064-1. The APC was funded by the same funder. DS Repositorio Institucional de la Universidad de Huelva RD 31 may 2026