Greenacres Disability Services has commissioned a new report which calls on the Commonwealth Government to work with service providers, their employees and unions to improve job security - and NDIS client satisfaction.

Further, Greenacres CEO Chris Christodoulou said, colloborative action would ensure the viability of providers - and ongoing access to services.

"Prior to the transition to the NDIS, providers were able to maintain a permanent, stable workforce," he said.

"That was a consequence of block funding received by providers for participants, which meant they could organise employees around that block funding.

"While the NDIS model provides control and choice to participants, everything is funded on the hours the participant comes to the service - and they can cancel or change at any time.

"So cost blowouts occur when permanent staff are rostered on, yet not engaged in productive work due to cancellations or changes.

"For many providers, the easiest option is to engage casuals so they can respond to participants' needs."

However, Mr Christodoulou said, the casualisation of the workforce was not beneficial for employees - and ultimately would lead to a reduction in the quality of services being provided.

"The disability sector will start looking like the hospitality industry which is full of casual workers, with limited career paths," he said.

"This leads to a high turnover of staff and difficulties attracting people into the industry, and over time the quality of the services will decline."

Read more: Illawarra disability service provider calls for urgent fix to NDIS

The report, Where Secure Employment meets Clients' Needs, analysed the impacts of the NDIS funding model on disability support workers, and those they support.

"One of the key recommendations is for the government to bring all parties together to come up with a national workforce strategy," Mr Christodolou said.

"They could consider the report's options for action, which include minimising casual employment and instead adopting secure but flexible work provisions in enterprise agreements."

Natalie Laing, NSW Branch Secretary of the Australian Services Union said, the growth in casual employment was in no-one's long-term interests.

"This critical piece of work can be used by the industry to build real careers in what is a very transactional NDIS scheme which, by its very nature, can push employers to use more casual staff."

The RMIT University report, Dr Fiona Macdonald, will be launched on Friday in Sydney.