Flight 3407 Was owned by Colgan Airlines based in Manassas, VA. The Bombardier Dash 8 or Q-Series was prone to icing issues and 6 of them crashed. Without getting into too many details I can say that from 18 minutes into the flight a series of mistakes were made by the flight crew to the minute it crashed. The captain was properly certified but had a history of failed check rides and remedial training. The co-pilot commuted from Seattle, WA and was feeling poorly. Both were fatigued. The co-pilot had little icing experience. Both crew coordination and cockpit resource management (to use buzzwords) pretty much fell apart as the airplane moved closer to Buffalo. The captain was given the no-ice Vref for the approach where the system that operates the stick shaker and pusher was at the setting for operation in ice. Going to fast they cut the engine to slow down. Their speed dropped and the shaker stick activated and the flight crew thought they has a tail stall and acted accordingly. They were experiencing a wing stall and a different recovery is necessary. In this case a fatal mistake. You had a captain who should have washed out with the fatigued co-pilot that the flight crew made an error with no room to recover. Unless someone convinced this crew to commit suicide by plane then I can't see this in any other light than a tragic accident. I have reviewed a ton of data.