Hi Thomas: Delivery is important and having an effective delivery style is essential. I think certain topics may require us to adjust how our prestaion is delievered, and I think being natural, genuine, and honest will always be an appropriate deliverty method. This tends to come off as smooth, with a air of authority and competency. There is something to be said about the importance of consistency, and students can become uncomfortable if too many versions of their teacher appear. Regrads, Barry