The Iris Explorer is a very powerful visualization tool. It is designed in a modular manner to offer maximum flexibility and feartures an intuitive point-and click interface. Visualizations ranging from simple bar graphs to complex color-coded contour graphics on 3D objects are possible. In addition, users can develop and program their own modules with the help of a library of visualization functions. The Iris Explorer is provided and licensed by the NumericalAlgorithms Group (NAG).