The disability sector has urged the Abbott government not to delay the rollout of the National Disability Insurance Scheme following the release of a report identifying "significant problems" with the agency that runs it.

A capability review of the National Disability Insurance Agency, released on Thursday, likened it to a "plane that took off before it was fully built and is being completed while it is in the air".

Senator Mitch Fifield says a report on the NDIS delivers a 'damning verdict' on the former Labor government. Credit:Andrew Meares

While praising the agency for achieving successes against the odds, the review identified problems including: