It has been proved experimentally that visual interactive simulation (VIS) is useful in specific contexts. Interaction with the simulated system remains one of the key issues that need to be addressed for VIS to be applied on a large scale. Little work has been reported recently on using modern computers that offer new types of user interfaces for solving the problem of interactivity with simulations. This paper introduces the multichronic tree user interface concept that provides users with tools for interacting with and visualizing multiple simultaneously running simulations. This new VIS concept builds on previous systems, formalizes operations and adds several interactive features that can be supported by state-of-the-art computer architectures and display environments. A prototype of the multichronic tree concept is presented along with a discussion on how it could be integrated with other tools in a more general framework for helping users in their simulation exploration process.
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