ly. They reported seven studies of various
aspects of that question. I'll focus on their Study 2, in which they used
three independent groups to compare all three conditions illustrated in
Figure 14.1. The BeforeAfterInfo condition, in the middle panel, comprises
three BeforeAfter pairs, thus providing extra information about the before
and after endpoints. The researchers included this condition in case any
advantage of Progressive might stem simply from having more images, rather
than because it illustrat