Abstract: This report provides the results of a Most Significant Change (MSC) evaluation of the North Australian Indigenous Land and Sea Management Alliance Ltd (NAILSMA) I-Tracker Initiative. The MSC evaluation examined the effectiveness and impact of I-Tracker in supporting Indigenous land and sea management activities in northern Australia. The MSC project has captured the views of 66 storytellers in 59 on-country interviews. From these interviews, a total of 190 stories were extracted that give a firsthand account of the changes that the I-Tracker initiative has made on-country. This report identifies the thirty stories that tell the most significant changes that have occurred as a result of the I-Tracker initiative. An expert Selection Panel agreed on the final thirty stories in a workshop setting, with reasons documented for their decisions. Conclusions The I-Tracker initiative has been successful in moving from an innovative idea to a mainstream aspect of Ranger best practice. As a result, the initiative has garnered respect on-country, nationally and internationally. This success can be attributed to NAILSMA’s bottom up approach in developing a tool that is being created by Ranger groups to suit their needs and aspirations. This has fostered a high level of on-country ownership of I-Tracker and consequently, Ranger groups are confidently sharing and communicating their I-Tracker activities, thereby connecting their land management efforts with the wider community. The shift to easily capturing and communicating their self-determined land management practices has resulted in number of on-ground changes for Ranger groups including: overcoming literacy and numeracy limitations to capture rigorous, specific data; - facilitating the transfer of Indigenous Ecological and Cultural knowledge between generations; - more effectively monitoring a huge area of land and sea country; providing a centralised program dedicated to standardised and systematic data collection; - engaging in simple and efficient reporting for internal and external stakeholders; - providing opportunities for fee for service work for agencies; - stimulating the adoption of further IT technology by Rangers; - fostering an active network of land and sea managers across northern Australia.