There is also a risk that payment by result might mean organisations target those who will likely give them good results.

BBC: Can the probation changes cut reoffending?

"This is a unique opportunity to unite the profession against the reintroduction of the discredited payment by result system, " said Mr McAvoy.

BBC: Ballot demanded for teachers' performance pay

In June 2012, the Scottish government published the consultation paper on changes required as a result of the introduction of Universal Credit and Personal Independence Payment by Westminster.

BBC: Scottish Parliament