Performance Cat A definition
Provides critical engine failure performance capability for continued flight or safe rejected take-off
Performance Cat B definition
No guaranteed capability to continue safe flight in the event of an engine
failure
Performance Class 1 definition
Safely continue or land with the rejected take-off / landing area
Performance Class 2 definition
Safely continue or land within rejected takeoff area, except when failure happens before TDP or after LDP, in which case a safe forced landing can be made