“…Simulations are a powerful form of CAL as they have the potential to enable the user to carry out experiments that would otherwise be impossible. Many studies have shown that simulations are equally successful or more effective than real experiments in increasing understanding and promoting interactive learning in subjects ranging from Geography to Medicine (Carstensen, 1993;Cavender and Rutter, 1997;Coleman, 1994;Dewhurst, 1994;Dobson, 1995;Doran and Klein, 1996;Fouad and Burleson, 1997;Guzdial, 1994;Hillis, 1994;Lilienfield and Broering, 1994;Miller and Cooper, 1995;Pamula, 1994;Pollock, McAteer et al, 1996;Samsel, 1994;Sewell, 1996;Silva, 1994;Tosunoglu, Butcher et al, 1996;Woodrow, 1995;Worthington, 1996). However, previous studies have not analysed the factors that affect these learning gains.…”