 Experimental design folks. It's the design you used when you decided when you did your experiment. Really? It's just the procedures and things that procedures, the sequence of conditions, so on and so forth that you use to test the experimental question. In other words, what effect does the independent variable have on the dependent variable? How or doesn't have an effect even? So how you design an experiment, what the procedures that you choose to use, are going to use an A-B design? Not an experiment. You use an A-B-A design? It's a decent experiment. How about an A-B-A-B design? Well, now you've got a good experiment. Again, we can get into other types of experiments for large-ends group research stuff, but no. Not that I don't like them, but in this context I don't like them. So anyway, experimental design, it's just the procedures that you used when you conduct an experiment.