“…Mental models have been a focus of research on the representation and use of causal knowledge in many domains including naive physics (Forbus & Gentner, 1986;McClosky, 1983), astronomical knowledge (Vosniadou & Brewer, 1992), spatial representations (Forbus, 1983;Glenberg & McDaniel, 1992;McNarma, 1986), problem solving by analogy (Bassok, 1990;Gentner, Rattermann, & Forbus, 1993;Holyoak, 1984;Holyoak & Koh, 1987;Keane, 1988), physical mechanisms (Hegarty & Just, 1993;Kempton, 1986;Kieras & Bovair, 1984), the understanding of man-machine systems (Chee, 1993), judgments of probability ( Johnson-Laird, Legrenzi, Girotto, Legrenzi, & Caverni, 1999;Kahneman & Tversky, 1982), and propositional reasoning ( Johnson-Laird, Byrne, & Schaeken, 1992). Although the mental model concept has its share of critics (e.g.…”