“…only when necessary and when the animation is not too difficult to use (Betrancourt & Tversky, 2000). But most of these studies have been performed in laboratory settings (e.g., Kaiser, Proffitt, Whelan, & Hecht, 1992;Palmiter et al, 1991) or use tasks specially crafted to show animated or static pictures (e.g., Pane et al, 1996;Rieber, 1991 (Palmiter & Elkerton, 1993), to teach computer science algorithms (Byrne et al, 1999) to teach how something works (Mayer & Anderson, 1991;Pane et al, 1996), and to understand other complex dynamic systems, like the weather (Lowe, 1999). Indeed, the prevalent feeling in this body of literature is that animations should be better than static images because, by a principle of congruence, animations should be a natural medium for conveying information about change, just as graphics are a natural way for conveying information about space (Tversky et al, 2002).…”