Federal NDIS minister Stuart Robert has announced changes including allowing people to lengthen plans from one to up to three years.

"A longer plan duration means participants can carry on accessing supports without needing to go through frequent plan reviews and can plan for longer term goals," he said.

The longer plans will be available on request, though some like Bendigo's Jye Yates say they will stay on yearly plans.

"My health needs change every year so I might need more care," he said.

"I've had seizures and am having trouble swallowing food. So I need more speech pathology, more physios, dietitians."

Mr Yates lives with cerebral palsy and has been on the NDIS for two years using services provided by Scope in Bendigo.

Optional three year plans will best for participants in stable situations with needs unlikely to change, Mr Roberts said.

They would be for people confident their funds would achieve their goals and who were working on long term goals like learning new skills, moving into or maintaining employment or becoming more active in the community.

Monday's NDIS announcement comes after Mr Roberts announced a plan to improve the service, acknowledging the rollout since 2016 had "not always been easy" in an address to the National Press Club last Thursday.

The plan includes improving long-term outcomes and give people better access to quality decision making.

"The image of a plane taking off while still being built remains an apt description."

A number of parliamentary inquiries have head of problems with the scheme.

Feedback from people with disabilities showed it was "not always living up to high expectations", Mr Roberts said.

"I have frequently said we are about 80 per cent there, with 20 per cent left to go. And the last 20 per cent is often the hardest."

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