The educational value of microworlds has been accepted as an article of faith. This research note defines microworlds as simulators based on system dynamics models of particular business systems. Subsequently, it explores how business students perceive microworld simulation. This research draws on data obtained from courses in undergraduate business programs as well as a postexperience MBA program. The data suggest that the learning benefits perceived by students are substantial. Moreover, mature students are more likely to benefit from microworlds than less mature ones. (Contains 2 tables.)