DRO: Reinforce absence of a behaviour
DRI: Reinforce an incompatible behaviour
DRA: Reinforce an alternative behaviour that can happen at the same time
DRH: Reinforce higher rates of a behaviour
DRD: Reinforce diminishing rates of a behaviour
DRL: Reinforce lower rates of a behaviour (without eliminating it)
In summary, differential reinforcement is a simple, structured way to either increase or decrease specific behaviours by reinforcing what you want and ignoring or extinguishing what you don’t want. Keep it simple: Reinforce the good, ignore the bad.

