Course topics - objections to Staley or Fisher?

I am quite pleased to see, so far, that there are no objections to the readings by Staley or Fisher. As I prepare for my presentation next Tuesday, I would truly appreciate it if all of you (participants) would be able to tell me ANY concepts you are having trouble comprehending in Chapter 2 of "The design of experiments"; or if there is anything in the first TWO chapters in Fisher's "The design of experiments" that's unclear to you! The reason for this request is because your comments would give me a much better idea of what I should focus my presentation on, so that I am able to better meet the needs of the audience. So, please, feel free to tell me about ANY difficulties that arise during your reading of Fisher BEFORE next Tuesday and I will try my best to accommodate them into my presentation!