Darren Lehmann concedes he erred in the Ashes and is as culpable as any player in the vanquished squad.
England reclaimed the urn with ease at Trent Bridge, wrapping up an innings and 78-run victory in under an hour on day three.
Lehmann admitted his charges were no closer to grabbing an elusive UK Ashes win than in 2013, when he stepped in as coach 16 days before the series stared.
“We played better in 2013 to be perfectly honest,” Lehmann said.
Michael Clarke will retire after the fifth Test, while his predecessor as captain Ricky Ponting suggested up to half of the squad may never play another Test.
Cricket Australia (CA) will forensically review the woeful batting collapses and wayward bowling that cost them victories at Cardiff, Birmingham and Nottingham.
Already, Lehmann has highlighted the failures of his coaching panel and chairman of selectors Rod Marsh.
“We’ve got things wrong at certain times, there’s no doubt about that,” Lehmann said.
“We’ve got to own up like players have to and everyone else.
“Our performances weren’t good enough.”
Asked for an example, Lehmann offered up the decision to drop allrounder Mitch Marsh for the fourth Test.
The 45-year-old noted it did not have an impact on the game which started with Australia being skittled for 60 in the fastest first innings in Test history.
But he added it was a clear mistake to promote Shaun Marsh at the expense of his brother.
“I spoke to Rodney this morning and we wanted the extra batter and spoke to the captain about it in this particular game,” Lehmann said.
“We always wanted five bowlers, so we probably got that selection wrong.
“I’m happy to admit when we’re wrong, you don’t get everything right.
“That’s a good learning curve for us.”
Hindsight suggests the time of the squad announcement, which came two days after Australia’s World Cup final win in March, was another blunder.
“We’ve had that discussion as a selection panel and that was a tough one for us,” Lehmann said.
“We were guided a bit by above and how we wanted to move around from West Indies to England.
“If we had our time again we’d probably prefer to pick different squads at different times.”
Australia haven’t lost four consecutive UK Ashes series since federation.
Lehmann vowed no stone would be left unturned as he, team performance boss Pat Howard and chief executive James Sutherland pick up the pieces.
“We’ll look at all areas where we can improve,” he said.
“We’ve got a bit of thinking to do and reviewing what went wrong.
“That’s just what you do after series like this.”
Working out how to rejig the XI without Clarke and identifying players capable of performing in the 2019 Ashes will be among the priorities.
“We lost one of our greats,” Lehmann said.