Clive Griffiths has left his position as head coach of Worcester. The club said Griffiths had notified them of his intention following a mid-season coaching review.
The Welshman moved to Sixways from Doncaster in May 2006, renewing links with the Warriors' rugby director, Mike Ruddock, after they oversaw Wales' 2005 Six Nations grand slam together. Worcester reached last season's European Challenge Cup final, losing to Bath at Kingsholm.
Worcester are through to this season's Challenge Cup quarter-finals, where they will play Brive in April, and appear to be safe from Premiership relegation.
Griffiths said: "I wanted to take this decision now so that the club could quickly develop a new focus, coaching philosophy and structure.
"It has been a very difficult and emotional decision to make, but I have done so in the interests of myself, my family and the club. I will follow the club's fortunes closely, as I have made a number of friends at Warriors. I wish them all the very best for the future."
Ruddock said he had accepted Griffiths' decision with "great difficulty".
"Following the mid-season review that we had, it became clear that Clive and I had differing thoughts on the best way to take the club forward," he said. "I have worked in partnership with Clive for a number of years at both club and international level, and I would like to put on record that he is an outstanding coach with a huge amount of experience under his belt.
"Everyone at Worcester recognises the need to make further strides towards our goal of achieving Heineken Cup qualification and competing in the top four of the Guinness Premiership. Clive felt that by making this decision now to stand down as head coach, the club could restructure its coaching team as soon as possible to take Warriors forward into 2009 and beyond."
The Scotland scrum-half Chris Cusiter has signed a three-year deal with Glasgow. The 26-year-old, who toured New Zealand with the Lions in 2005, when he was a member of the now-defunct Borders side, will join Sean Lineen's side from Perpignan.
Cusiter said: "I'm joining an ambitious club with huge potential and I'm excited about the challenges that lie ahead. Both Scottish pro-teams have been getting good results recently and Glasgow have made their future intentions clear with some great performances, especially with the recent win over Toulouse.
"Playing in France has been a fantastic experience and I've learnt a lot. I now look forward to a successful end to the season with Perpignan before returning to Scotland in the summer.
"I believe it's the right time to come back to Scotland. I'm looking forward to earning a starting place for Glasgow which, in the long run, may also help my international aspirations as we look forward to the World Cup in 2011."
Lineen said: "It's fantastic news. Chris is a world-class player who I've admired for many years. The experience he has from playing in France cannot be underestimated. Today's signing shows that Glasgow are moving in the right direction and I can't wait to see Chris in a Warriors shirt next season."
Cusiter has won 39 caps and is part of Frank Hadden's squad who are preparing to play Wales at Murrayfield on Sunday 8 February.
The Wales and Ospreys full-back Lee Byrne expects to be fit for that match.
Byrne, who injured an ankle against Perpignan 10 days ago and missed the Ospreys' 15–9 win over Leicester last weekend, said: "I've no concerns, none at all, about the Scotland game.
"I am getting there now. I've been icing it up and done a bit of rehab work, and it is feeling much better. I had a fitness test last Thursday, and there was a little bit of a reaction on the Friday, so I had to use my head and pull out [of the Leicester game]."
