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When senior reporter Kate Lyons scratched beneath the surface of the National Disability Insurance Scheme, she says she found so many hugely complex issues that it was like ‘opening a spring-loaded box-lid’. She tells Reged Ahmad about how, after 18 months of changes – from automated assessments to new definitions of impairments – and as the government tries to limit a blow-out in spending, what comes next could be the biggest moment yet for the scheme since it began