 The term is contingent. It describes a stimulus that is delivered after a behavior, and meaning that the behavior has to occur first in order for it to be contingent. Sounds a little tricky, right? So here's the point. You engage in an action. If you don't engage in that action, I'm not going to give you the reinforcer. If you do engage in the action, you get the reinforcer or the punisher or whatever it is, right? So the behavior has to happen first. Remember, go back to the video contingency. It talks about a rule about something happens, then something else, kind of like a consequence anyway. So the point is, is that in order for reinforcers and punishers to work, they have to be contingent on the behavior. And in fact, the word contingent is included in the definition of reinforcers and punishers. I think that's about it. I don't know what else to add. So