Computational Steering and Interactive Visualization by Chris Johnson Department of Computer Science University of Utah www.cs.utah.edu/~sci Abstract In this seminar I will present the design, implementation and application of SCIRun, a scientific programming environment that allows the interactive construction, debugging and steering of large-scale scientific computations. Using this "computational workbench," a scientist can design and modify simulations interactively via a visual programming environment. With SCIRun scientists can automatically change parameters associated with a particular numerical method, boundary conditions or even the geometric structure of the computational mesh. As opposed to the typical "off-line" simulation mode - in which the scientist manually sets input parameters, computes results, visualizes the results via a separate visualization package, then starts again at the beginning - SCIRun "closes the loop" and allows interactive steering of the design, computation, and visualization phases of the simulation. I will provide examples of several driving applications of steering and interactive visaulization in medicine - specifically in cardiology, neuroscience, and imaging. Request for preprints and reprints send to Chris Johnson at crj@cs.utah.edu