Jack Dongarra, University of Tennessee and Oak Ridge National Laboratories Supercomputers and Clusters and Grids: Oh, My! Abstract: In this talk we will look at the changes that have taken place in the area of High Performance Computing over the last 10 years, and will look toward future trends. He will advocate the "Grid" to support large-scale applications. This envisaged Grid must provide transparent access to the complex combination of tools necessary for solution of applications problems - computational, networking, and storage - that can be provided through aggregation of distributed resources.