England manager Martin Johnson has stood down after three-and-a-half years in the role.
Johnson's decision follows a miserable World Cup which ended in quarter-final defeat by France and also featured a series of off-field controversies.
"I think it is in the best interests of both the England team and myself not to carry on," said the 41-year-old.
"I have a choice at the moment. If I hadn't made that decision someone may have made it for me."
JOHNSON'S ENGLAND RECORD
Games coached - 38
Wins - 21
Defeats - 16
Draws - 1
Points for - 826
Points against - 652
Winning rate - 55.3%
Johnson won 84 caps for England as a player, leading the side to victory in the 2003 World Cup, but during his time as manager England won only 21 of the 38 matches played.
"While we've had our most successful season with 10 wins from 13, we are disappointed with how we ended it with the World Cup. I think it's the right decision at this time. It's a thoughtful and considered opinion," continued Johnson, who had no previous top-level coaching experience when appointed.
"Part of me regrets leaving the job in these circumstances. There is unfinished business and a feeling to put things right, but I won't leave with any regrets.
"The cycles are from World Cup to World Cup and you have to decide whether you are prepared to jump in for four years and wholly commit yourself to that job and weigh it up. I'm not."
There were also several other incidents of indiscipline during the tournament, but Johnson dismissed suggestions that his players had to take some of the blame for his departure.
"I haven't been let down. We toured together. Things get reported, but I don't think it was an accurate representation," he added.
"It made it difficult for us, but how much it affected things on the field, no one could answer that."
Johnson's departure drew mixed reaction from around the game.
Ex-England and Lions centre Jeremy Guscott, a former team-mate of Johnson's, told BBC Sport that the former Leicester player had "done the right thing", adding that "England's performance at the World Cup was abysmal and that was the end".
“The writing was on the wall for Johnno when he selected Steve Borthwick as captain”
Former England captain Will Carling tweeted: "Sad for MJ. The man was an awesome player, incredible captain. One of THE greatest England players/servants."
The Rugby Football Union's director of elite rugby Rob Andrew, who has overseen three England managers during his time at Twickenham, said he would not be following Johnson in leaving his job.
"I'm absolutely not considering resigning. In terms of the department and the structure of the professional game - that's my role in this," he said.
"My job is to run the department, not just the playing side of things."
Alastair EykynBBC Sport rugby union commentator
Johnson has been honourable to the last but it is a disappointing end for the man who led England to the 2003 World Cup. There were bright moments along the way. England's win over Australia in Sydney in 2010 was an outstanding display, as was their victory over the Wallabies at Twickenham a few months later. Johnson's side also won the Six Nations in March, despite a hefty defeat by Ireland in the final match, but it is clear he was not given the necessary support from his employers. Johnson's resignation may well lead to increased calls for his immediate boss, Rob Andrew, to step down as well.
The position of Johnson's backroom staff of forwards coach John Wells, defence coach Mike Ford, scrum coach Graham Rowntree and attack coach Brian Smith is still not clear.
Johnson defended his coaching colleagues, saying he would not have continued in the role had they been removed by the RFU.
"That wouldn't have worked for anyone," he added. "They have handled themselves with a huge amount of integrity amid inaccurate speculation on their capabilities.
"International rugby is different from club rugby, from European rugby. They have a huge amount of knowledge and experience, it would be a waste for that to be lost from the union."
Former South Africa and Italy coach Nick Mallett was considered one of the front-runners to replace Johnson
but ruled himself out on Wednesday,
while New Zealand's 2011 World Cup-winning coach Graham Henry is thought to be in the frame.
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