Steve Waugh's top-ranked team have been heavily criticised in recent years for their persistent on-field sledging and CA is determined that Australian players clean up their act.

Under the new policy, players could receive a ban of between five matches and life for assault and offences of a racial or religious vilification nature, the CA said on its website.

Players could also be fined or given suspended sentences for dissent towards an umpire or excessive appealing.

"We have given our players a clear definition of what is required," CA operations manager Michael Brown said.

"We are limited to Test and domestic players, but ultimately you would like to think that local teams will adopt our guidelines."

Brown added that the tough penalties would be enforced during the 2003-04 season. Australia's two-Test series against Zimbabwe starts in Perth on October 9.

In May this year, the outgoing International Cricket Council (ICC) president Malcolm Gray ordered a review into the behaviour of Australia's cricketers during their away Test series with West Indies.

Gray was especially concerned with an on-field row between Australia fast bowler Glenn McGrath and West Indies batsman Ramnaresh Sarwan during the fourth Test.

The images of McGrath finger-pointing and screaming at Sarwan over something he apparently said prompted CA chief executive James Sutherland to tell captain Steve Waugh to rein in his players' emotions.

Sutherland called that an "ugly incident".

McGrath said at the time he was surprised by the amount of publicity the Sarwan incident generated in Australia. He later apologised for his actions and made peace with Sarwan.

Australian Gray, who retired as ICC president in June, has urged the world body to lead the change towards better player behaviour, while adding that national cricket boards also had a responsibility to improve player behaviour.

"In terms of process it is an ICC matter, in other words the umpires, referees and so forth," he said.

"However, in terms of the longer-term problem, it really is up to the national bodies to develop within their teams a change in culture."

Former India captain Sunil Gavaskar has led criticism of Waugh's team for their on-field sledging, while emphasising sledging was not a widespread problem at Test level.

Waugh, however, sees things a little differently.

"Of course we do things wrong and I'm not going to say we're perfect," he said earlier this week.

"But I think we're moving in the right direction."