NHL teams do their due diligence on every transaction and work hard to limit mistakes. The idea of making trades is to borrow from areas of strength in order to address weaknesses.
There are times when the best-laid plans blow up, and when it happens, managers sometimes answer with their jobs. No team in the league can avoid these kinds of trades, but some are more harmful than others.
Here's a team-by-team look at the biggest blunders over the past five seasons.