When most BDSM resources speak about Discipline they focus on punishments. Putting such a large emphasis on punishments instead of power exchange has caused a distortion. Discipline isn't a kink, it's the structure of power exchange relationships. Starting from the basic psychological and social building blocks of any society or culture our relationships include: Structure, Protocols/Rules, and Routines/Rituals. Cumulatively these three create the building blocks on which a system of Rewards/Benefits and Consequences/Punishments are derived. This is the what the "D" for Discipline within BDSM stands for.