 I'm going to try to keep calm face because this angers me. Indirect assessment is the term and I understand that we operate in a real world and that sometimes you have to do this crap, but I really hope you don't do this. I just, it's when you measure something other than the behavior of interest and you use that to indicate something about the behavior of interest. In other words, you're measuring something that you're not really measuring. You're trying to find out something about something you're not measuring, which makes it indirect, which gives it a problem and you might be indirectly assessing the fact that I'm angry based on the way I'm talking to you. In reality, I'm not angry at all, but you can't directly assess that. You can infer it through indirect assessment, but that's bad. We don't like inference. Inference sucks. This is behavior analysis. We like concrete, that was wood, sorry. So we like wooden examples. We like concrete ones too. We like concrete wooden examples for that matter. But the point being that we just need to directly observe things. Go see the video on direct assessment to understand why that's better. But indirect assessment, where you're taking the measure of one thing as an indicator of something else. In reality, this isn't something we like. I do want to give you one more very brief example. It's really hard to directly assess how many condoms people use to give at nights. What you can do is look for the number of condoms that were left over in the garbage. That's it, bye.