The NDIS Scheme seeks to enable people with disability to exercise choice and control over the planning and delivery of their supports. To ensure that the scheme truly works to secure choice and control for people with disability, NDIA decision-making processes need to be accessible, explainable and understandable. The ARC Discovery Project Adjudicating rights for a sustainable NDIS aims to contribute to this objective by exploring the mechanisms and challenges for current review and appeal processes using interview data and document analyses. This brief includes four key findings with recommendations, informed by interview data, to assist the NDIA and the Australian Government to ensure NDIS participants understand decisions, how these are made in relation to their supports, and how to access review and appeal processes where desired.