Considerations about scheme sustainability and any consequent policy ‘solutions’ must be evidence based; based on independent research; and trust, codesign and transparency are critical. 2. Any consideration of overall sustainability of the scheme must balance the costs of running the scheme against the economic and social benefits the scheme produces. There will also be non-economic benefits such as increased dignity and individual and family wellbeing that should be considered. 3. Economic data on broader benefit of the NDIS, including cross-budgetary savings for both the Commonwealth and States (for example, in health and hospitalisation costs, justice costs) is not currently available. In the absence of this data, policy responses which restrict NDIS access or reduce individualised supports may increase financial burdens on other aspects of Commonwealth and State budgets which is counterproductive to the original intent of the NDIS. 4. Transaction costs of a scheme which under-performs or which is not administratively just need to be accounted for, for example, the cost of increased AAT appeals. 5. More research is required on whether early intervention reduces scheme costs long-term; whether current exit rates are appropriate; whether services delivered are value for money in terms of benefits provided; the extent to which supports are reasonable and necessary and what benchmarks are used to measure this. 6. Any questions relating to financial sustainability of the NDIS should take into account Australia’s obligations under the CPRD.