 So, a schedule of reinforcement, other than being a very long but wonderful book, is really just a rule that specifies how reinforcers are arranged for delivery with regard to the behaviors that they're supposed to reinforce. So how many behaviors do you need to engage in? At what time are you going to deliver reinforcers? And so on and so forth. It's really a rule, right? So, I don't like saying that, but it really is a type of rule. It's a description of the pattern of how reinforcers are delivered around the responses that they're associated with. Another way to think of it is a description of a contingency of reinforcement, a detailed description of a contingency of reinforcement. That's really it. I mean, you've got the VRs, you've got the VIs, you've got the FRs, you've got the FIs, you've got the FTs, you've got the NCRs. You've got all sorts of different types of schedules of reinforcement. They all intermix to do all sorts of different things, and then you can get to the really complex ones and talk about, you know, chain schedules and tandem schedules and concurrent schedules. And the point is that the schedules of reinforcement is a broad term, talking about that rule with how reinforcers are delivered in relation to the behavior that they're associated with.