Participatory 3D modelling (P3DM) is one of the most remarkable innovations of the late 20th century. This volume bears testimony to the multiple uses and values of P3DM. In the examples described, the uses to which communities have put their models include natural resource planning and management; land and ocean rehabilitation; mapping their ancestral territories and establishing their rights; planning for conservation; disaster risk reduction and adaptation to climate change and variability; educating children in schools about their history and cultural heritage; bringing together community members with differences; and negotiating with officials and influencing policy.