“…The monitoring and reporting conditions attached to PES projects are one of the primary obstacles to attracting and securing adequate remuneration for environmental service provision (Wunder 2007), particularly in developing regions where the technical, administrative and organisational capacity of the population is often low (Ferraro 2001). Paradoxically, it is in developing regions that most socio-economic benefi t can be gained from PES projects (Pagiola et al 2005), especially where local communities have a history of providing environmental services, such as customary fi re management by Indigenous communities in northern Australia (Yibarbuk et al 2001;Whitehead et al 2008;Garde et al 2009;), without adequate remuneration (Muller 2008). Here, I present fi ve case studies which demonstrate how Indigenous Land and Sea Management (ILSM) groups (locally known as rangers) in remote, economically poor, Arnhem Land in northern Australia (Figure 1), have used innovative monitoring techniques to measure the environmental outcomes of their land management activities which include fi re, feral animal and weed management, and biodiversity and ecosystem protection.…”