Cassidy acknowledged that he struggled with communicating and relating with NHL players during his time in Washington. A defenseman who was selected by the Chicago Blackhawks in the first round (No. 18 pick) of the 1983 NHL Draft, Cassidy played 36 games with the Blackhawks over six seasons from 1983-84 to 1989-90.
He had not coached in the NHL before being hired by the Capitals.
"I was a younger guy, really no NHL acumen," Cassidy said. "I played a few games up in Chicago here or there, so that was a learning experience for me how that world works. This time, I was a lot better prepared for it."
Cassidy had to be patient. He spent eight seasons with the Bruins' American Hockey League affiliate in Providence, including the last five as coach, before joining Boston's staff as an assistant in 2016-17. Cassidy replaced Claude Julien as coach on Feb. 7, 2017 and guided the Bruins to an 18-8-1 record and a third-place finish in the Atlantic Division.
This season, the Bruins went and finished second in the Eastern Conference with 107 points.
"You learn in 15 years," Cassidy said. "If you want to get back, you've got to do things differently, take what you did well, learn what you didn't do well. Part of that was how I communicated my message. I've learned to be better with it. Players are more receptive to it now than they were then, so shame on me. But that's the way it goes."
Berube, who played in the Cup Final with the Capitals in 1998, also cited communication as his biggest area of improvement from his first NHL coaching job with the Philadelphia Flyers. Unlike Cassidy, the 53-year-old had extensive NHL experience, playing 1,054 games over 17 seasons with the Flyers, Capitals, Calgary Flames, Toronto Maple Leafs and New York Islanders before retiring in 2004.
After working his way up with Philadelphia, beginning as an assistant in the AHL in 2004-05, Berube replaced Peter Laviolette as Flyers coach three games into the 2013-14 season. Philadelphia went 42-27-10 under Berube and qualified for the Stanley Cup Playoffs before losing to the New York Rangers in the Eastern Conference First Round.