VSiM facilitates the real-time exploration of highly detailed, three-dimensionalcomputer models in both formal and informal educational settings. This NEH-fundedsoftware addresses the greatest challenge for building knowledge through use of three-dimensional computer models by providing scholars and educators the mechanism to explore,annotate, craft narratives, and build arguments within the 3D space – in essence, facilitating thecreation of virtual learning environments that can be broadly disseminated to educators andlearners across grade levels and humanities disciplines.