The Neighbourhood Index is Oslo Architecture Triennale’s catalogue of neighbourhood projects, practices and perspectives. This work contributes to the Triennale mission: creating more sustainable, diverse and thriving neighbourhoods. The aim is to show visionary ideas and examples on how to form better neighbourhoods: What are the practical, architectural, and social features of good neighbourhoods? How can we share more at a neighbourhood scale? How can new urban areas become more diverse and socially and environmentally sustainable? The index highlights both urban form – the physical planning and design of neighbourhoods – and the community life at a neighbourhood scale: the content of the built environment. The index thus features both practical and systemic reflections, small-scale interventions and master plans, physical and social projects.