Many using the Internet are very savvy about visual media, having already watched copious amounts of television and motion pictures. With few exceptions most have seen countless hours of video in which production quality is very high. Further, many have read large amounts of text-based information, which has been professionally edited and type-set. As a result, some participants in this study may have been negatively impacted components containing imperfections. As one participant (P12) said, "...that's a whole thing about the Internet, it needs a good edit". An interface must be very "clean" before effects or impact of learning on participants can be measured for effect on learning or health improvements [21].