England have challenged reborn Australian fast bowler Mitchell Johnson to prove he can sustain his firepower for the duration of a test match.
The West Australian left-armer has fought his way back into Ashes cricket after his deflating performance against England in 2010/11.
Ahead of Thursday's first test in Brisbane, those in the know say Johnson is armed with a new mindset and an improved action.
In recent one-day tours his pure speed has proven tough to handle. But England fast bowling coach David Saker warned success with the white ball is not test domination.
Saker said Johnson would need to show he could put effort on effort.