BAT is a training method created by Grisha Stewart for fearful, anxious or aggressive dogs.
BAT helps animals gain confidence and social skills.
BAT is a natural method that creates an emotionally safe interaction with minimal intrusion. BAT is especially useful when the “triggers” for frustration, aggression, or fear are living beings, for example when dogs bark at or bite other dogs or people.
Link: https://grishastewart.com/BAT-basics.pdf is easy to understand and has all the informations needed.