Every workplace and school has them - people who never accept that their achievements or marks are good enough.

Now there is a psychological term - clinical perfectionism - for these serious over-achievers.

Curtin University researchers say common traits include never being happy with their success and shrugging off praise by saying they could have done better.

They say lawyers, business chief executives and athletes are some of the worst offenders.

The researchers want to see if they can treat clinical perfectionists by stopping them constantly beating up on themselves.

Senior lecturer in the school of psychology and speech pathology Sarah Egan said the psychological disorder was more than wanting to do well and was characterised by a constant need to reach often unattainable high standards.

It was often accompanied by feelings of stress and worthlessness.

"High levels of perfectionism can lead to people experiencing anxiety, depression and eating disorders," she said.

The study will compare the results of face-to-face therapy with a self-help printed version.

To take part, phone 9266 3436 or email kimberley.hoiles@post grad.curtin.edu.au.